{"title":"Cylinder \u0026 Big Bore Kits","description":"Big Bore kits for Gas Scooters, Pocket Bikes, ATVs, Dirt Bikes \u0026amp; R\/C Engines.","products":[{"product_id":"naraku-gy6-585mm-big-bore-kit","title":"Naraku GY6 58.5mm Big Bore Kit - Forged Piston","description":"Naraku 58.5mm Forged Piston Big Bore Kit for 150cc and 125cc GY6 4-stroke engines and engine based vehicles. Easy to install! Just bolt on with no crankcase modifications needed.\u003cbr\u003e \u003cp\u003e\u003c\/p\u003e\u003cul\u003e \n\n\u003cli\u003eBore: 58.5mm\u003c\/li\u003e\n\u003cli\u003eOuter Sleeve Diameter: 60.3mm\u003c\/li\u003e\n\u003cli\u003eDisplacement Increase to 155cc\u003c\/li\u003e  \n\n\u003cli\u003eOverall Height (cylinder): 91.5mm\u003c\/li\u003e\n\u003cli\u003eStud Spacing: 76.5mm\u003c\/li\u003e\n\u003c\/ul\u003eGY6 QMI\/QMJ 152\/157, Various unlisted makes\/models\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964486385985,"sku":"137-9","price":185.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/451364.jpg?v=1792945402"},{"product_id":"hoca-70cc-2-stroke-big-bore-kit-12mm-piston-pin","title":"SSP-G 70cc 2-stroke Big Bore Kit - 12mm Piston Pin","description":"SSP-G 47mm Big Bore Head Kit for 50cc 2-stroke 40QMB, E40QMB, 1E40QMB and 1PE40QMB Minarelli engines.  \n\n\u003cbr\u003e \n\n   \n\n\u003cbr\u003e \n\n These engines are commonly found on many popular 2-stroke full-size scooters and ATVs such as Yamaha, Malaguti, Yamati, United Motors X-Speed, Aprilla, CPI, Benelli, Vento, Eton, Adly, Geely and many more. Includes cylinder head.\u003cbr\u003e\u003cul\u003e \n\n\u003cli\u003e \n\n\u003cdiv\u003eWrist Pin Length: 36.8mm\u003c\/div\u003e \n\n\u003c\/li\u003e\n\u003cli\u003e \n\n\u003cdiv\u003eWrist Pin Diameter: 12mm\u003c\/div\u003e \n\n\u003c\/li\u003e\n\u003cli\u003e \n\n\u003cdiv\u003ePiston Diameter: 47mm\u003c\/div\u003e \n\n\u003c\/li\u003e\n\u003cli\u003e \n\n\u003cdiv\u003eDisplacement: 70cc\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003eIncludes Wrist Pin Bearing\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ul\u003e40QMB 50cc 2-stroke, Diamo, Eton, Geely Model 18, Peugeot, TGB, Various unlisted makes\/models, Vento Zip R3i, Yamaha\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"SSP-G","offers":[{"title":"Default Title","offer_id":67964495888705,"sku":"169-153","price":168.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452210.jpg?v=1792945455"},{"product_id":"naraku-gy6-63mm-big-bore-kit","title":"Naraku 180cc GY6 Big Bore Kit - 63mm Forged Piston","description":"\u003cp\u003eGive your GY6 build more muscle with the \u003cstrong\u003eNaraku 63 mm Forged Piston 180cc Big Bore Kit\u003c\/strong\u003e. Designed for compatible GY6 125cc and 150cc four-stroke starting engines, this kit increases displacement to approximately 180cc for a stronger foundation for torque and acceleration tuning. A finned cylinder, forged piston, piston rings, wrist pin, retaining clips and gaskets bring the core components together for your big-bore upgrade.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCrankcase modifications are required to install this cylinder kit.\u003c\/strong\u003e This is not a drop-in replacement. \u003cstrong\u003eSee the \u003ca href=\"\/products\/boring-tool-case-gy6-150cc-ncy-brand?variant=67964580364609\"\u003eNCY Engine Case Boring Tool\u003c\/a\u003e to get the job done.\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm Big Bore:\u003c\/strong\u003e Increases displacement to approximately 180cc with the appropriate crankshaft stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged Piston:\u003c\/strong\u003e Performance piston supplied with rings, wrist pin and retaining clips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinned Cylinder:\u003c\/strong\u003e External cooling fins help dissipate heat from the air-cooled engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Gaskets:\u003c\/strong\u003e Cylinder head and base gaskets, along with additional sealing pieces, support assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment Measurements:\u003c\/strong\u003e 64.9 mm outer sleeve diameter and 54 × 54 mm cylinder-stud spacing help identify the required engine configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Naraku\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 137-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine application:\u003c\/strong\u003e Compatible GY6 125cc \/ 150cc four-stroke starting engines; excludes QMK and 169cc engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResulting displacement:\u003c\/strong\u003e Approximately 180cc, depending on crankshaft stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter sleeve diameter:\u003c\/strong\u003e 64.9 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall cylinder height:\u003c\/strong\u003e 90 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin:\u003c\/strong\u003e 15 mm diameter × 48 mm length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder-stud spacing:\u003c\/strong\u003e 54 × 54 mm center-to-center; approximately 76 mm diagonal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional mounting dimensions:\u003c\/strong\u003e 63 mm across the lower holes; 41 mm between the right-side middle and lower holes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation requirement:\u003c\/strong\u003e Crankcase modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eFor compatible 125cc and 150cc starting engines only. \u003cstrong\u003eNot compatible with QMK engines or 169cc starting engines.\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine family \/ codes\u003c\/th\u003e\n\u003cth\u003eFitment requirements\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003e157QMJ, 152QMI, YN1P57QMJ, JJ157QMJ, 1P57QMJ, BN157QMJ, 1P52FMI, 154FMI and other compatible QMI\/QMJ configurations\u003c\/td\u003e\n\u003ctd\u003e125cc \/ 150cc GY6-A engines only. Confirm 54 × 54 mm cylinder-stud spacing, 15 mm wrist pin, cylinder height and crankcase clearance.\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eHaving “QM” or “FM” in the engine code does not automatically make an engine compatible. Match the mounting pattern, sleeve diameter, cylinder height and wrist-pin size, and confirm compatibility with your cylinder head and crankshaft. Plan for crankcase modifications and appropriate fuel-system tuning as part of the installation.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964505751873,"sku":"137-11","price":225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/450887.jpg?v=1792793714"},{"product_id":"naraku-47mm-performance-cylinder-kit","title":"Naraku 72cc Big Bore Cylinder Kit 47mm - QMB139 \/ 139QMB","description":"\u003cp\u003eGive your 50cc four-stroke scooter a significant boost of power with the \u003cstrong\u003eNaraku 47mm 72cc Big Bore Cylinder Kit\u003c\/strong\u003e for compatible QMB139 \/ 139QMB 49cc and 50cc engines. The larger bore increases displacement to approximately 72cc with the stock 41.4mm stroke, giving you a solid starting point for a more powerful engine setup. The cylinder, piston hardware, and replacement gaskets come together in one kit, so you can spend less time gathering parts and more time on the build.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e72cc Upgrade:\u003c\/strong\u003e 47mm bore produces approximately 72cc when paired with the stock 41.4mm stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-In Cylinder Design:\u003c\/strong\u003e No crankcase modifications required on compatible engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched Piston Components:\u003c\/strong\u003e Includes piston, rings, wrist pin and circlips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGaskets Included:\u003c\/strong\u003e Head, base, exhaust and cam-chain tensioner gaskets support cylinder installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Naraku\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 137-13\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer reference:\u003c\/strong\u003e NK100.47\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder bore:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e Approximately 72cc with a 41.4mm stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder sleeve outer diameter:\u003c\/strong\u003e 53.1mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin diameter:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal piston height:\u003c\/strong\u003e 34.1mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine type:\u003c\/strong\u003e QMB139 \/ 139QMB 49cc–50cc four-stroke\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCylinder\u003c\/li\u003e\n\u003cli\u003ePiston and rings\u003c\/li\u003e\n\u003cli\u003ePiston wrist pin and circlips\u003c\/li\u003e\n\u003cli\u003eHead gasket\u003c\/li\u003e\n\u003cli\u003eBase gasket\u003c\/li\u003e\n\u003cli\u003eExhaust gasket\u003c\/li\u003e\n\u003cli\u003eCam-chain tensioner gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eFor compatible Chinese-market QMB139 \/ 139QMB 49cc and 50cc four-stroke scooter engines, including various unlisted makes and models. Compare the original cylinder mounting layout, 53.1mm sleeve clearance, 13mm wrist pin, and piston dimensions before installation. Engine code alone does not guarantee every engine variant matches.\u003c\/p\u003e\u003cp\u003eCheck cylinder-head compatibility, piston-to-valve clearance, and fueling setup as part of the build; additional tuning or components may be needed for your configuration. \u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964507160897,"sku":"137-13","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/Naraku_piston_0857226d-b60d-4ab0-96e1-2f58ff85d5da.jpg?v=1792793720"},{"product_id":"naraku-42mm-performance-cylinder-kit-for-sym","title":"Naraku 42mm Performance Cylinder Kit for SYM","description":"\u003cspan\u003eNaraku 50cc SYM and Peugeot 4-stroke 42mm Big Bore Cylinder Kit. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, base gasket, exhaust gasket and cam chain tensioner gasket.\u003cbr\u003e\u003cbr\u003eThis is a drop in cylinder kit, no crank case modifications required! When used in conjunction with a stock stroke of 46mm the total displacement comes out to 63.7cc.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFits the following \u003c\/span\u003e4-stroke\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003emodels: \u003c\/span\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eSYM Mio 50 \u003c\/li\u003e\n\u003cli\u003eSYM Fiddle II 50\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eSYM Orbit II 50\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eSYM Jet4\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eSYM Allo 50\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eSYM Cello 50\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eSYM Symphony 50\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLance Cabo 50 \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLance Cali 50 \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLance Havana 50 \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLance PCH 50 \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLance Soho 50\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003ePeugeot Vivacity \u003c\/li\u003e\n\u003cli\u003ePeugeot Speedfight 3 \u003c\/li\u003e\n\u003c\/ul\u003e\u003cspan\u003e \u003cbr\u003e\u003cul\u003e \n\n\u003cli\u003eUpgrades to 63.7cc  \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Bore: 42mm  \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder  Sleeve Outer Diameter: 45.7mm    \n\n\u003c\/li\u003e\n\u003cli\u003eWrist Pin Diameter: 10mm  \n\n\u003c\/li\u003e\n\u003cli\u003eTotal Piston Height: 33mm  \n\n\u003c\/li\u003e\n\u003c\/ul\u003ePeugeot, SYM\n\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e\u003c\/span\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964508635457,"sku":"137-15","price":195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/137-15_825c79c8-7d63-45d9-a10f-db29f3f3368d.webp?v=1792993054"},{"product_id":"47mm-qmb139-cylinder-kit","title":"Universal Parts 47mm 72cc Big Bore Cylinder Kit - 139QMB","description":"\u003cp\u003eGive your compatible 139QMB scooter a bigger-displacement foundation for your next off-road build. This \u003cstrong\u003eUniversal Parts 47mm cylinder kit\u003c\/strong\u003e upgrades a matching 50cc four-stroke engine to 72cc and brings together the cylinder, piston, rings and installation gaskets in one convenient kit.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e72cc upgrade:\u003c\/strong\u003e Increase displacement on compatible 139QMB-based 50cc four-stroke engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched top-end components:\u003c\/strong\u003e Includes the cylinder, piston, rings, piston pin and circlips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded gaskets:\u003c\/strong\u003e Head and base gaskets are supplied for the top-end installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinned cylinder:\u003c\/strong\u003e External cooling fins suit the air-cooled engine layout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefined fit-check dimensions:\u003c\/strong\u003e A 47mm bore, 52.7mm sleeve outer diameter and 13mm wrist pin help you plan your build.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Universal Parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 151-255\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine application:\u003c\/strong\u003e Compatible 139QMB-based four-stroke engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgrade displacement:\u003c\/strong\u003e 72cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder bore:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder sleeve outer diameter:\u003c\/strong\u003e 52.7mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin diameter:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal piston height:\u003c\/strong\u003e 34.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression height:\u003c\/strong\u003e 17.25mm, measured from the wrist-pin hole center to the top edge of the piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit contents:\u003c\/strong\u003e Cylinder, piston, rings, piston pin, circlips, head gasket and base gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eFor matching Chinese scooter 139QMB-based 50cc \/ 80cc engine applications using the following engine codes. This kit provides a 72cc configuration; verify existing components on previously modified engines.\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine Family\u003c\/th\u003e\n\u003cth\u003eEngine Codes \/ Applications\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eQMA \/ QMB\u003c\/td\u003e\n\u003ctd\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, BD1P39QMB, BN139QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdditional applications\u003c\/td\u003e\n\u003ctd\u003e139FMA-2, 147QMD, other matching QMA and QMB models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e You may need to modify your engine case to accommodate the cylinder's 52.7mm sleeve outer diameter.\u003c\/p\u003e\u003cp\u003eCheck the engine code stamped on your scooter before ordering. Engines marked with a listed code may use this kit, but verify sleeve clearance, wrist-pin diameter and piston dimensions against your engine. A code containing “QM” or “FM” alone is not enough to confirm fitment.\u003c\/p\u003e","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":67964508963137,"sku":"151-255","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/451359.jpg?v=1792793641"},{"product_id":"naraku-524mm-performance-cylinder-head-kit","title":"Naraku 52.4mm Big Bore Kit 89cc - 139QMB 50cc GY6 Scooters","description":"\u003cp\u003eThis \u003cstrong\u003eNaraku 52.4mm Big Bore Cylinder \u0026amp; Head Kit\u003c\/strong\u003e (SKU 137-4) is a complete top-end upgrade for 139QMB (QMB139) 50cc 4-stroke scooters, the Chinese GY6 50cc platform based on Honda's GY6 design. It bumps displacement to \u003cstrong\u003e89.3cc\u003c\/strong\u003e on the stock 41.4mm stroke, or \u003cstrong\u003e94.9cc\u003c\/strong\u003e with a 44mm stroker crank. The kit includes a ready-to-bolt-on head with larger valves, so you get a real jump in power and acceleration over a stock 50cc.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e52.4mm cylinder\u003c\/li\u003e\n\u003cli\u003eNaraku piston with rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003eCylinder head with valves and springs installed\u003c\/li\u003e\n\u003cli\u003eGasket set, including head, base, and exhaust gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig bore upgrade:\u003c\/strong\u003e 50cc to 89.3cc (stock stroke) or 94.9cc (44mm stroker crank).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance head:\u003c\/strong\u003e Non-emissions design with larger 23mm intake and 20mm exhaust valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved flow:\u003c\/strong\u003e 20.8mm intake port and 18.7mm exhaust port.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete kit:\u003c\/strong\u003e Everything needed for the top-end swap in one box.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 137-4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder bore:\u003c\/strong\u003e 52.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder sleeve OD:\u003c\/strong\u003e 54.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin diameter:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal piston height:\u003c\/strong\u003e 36.3mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression height:\u003c\/strong\u003e 20mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake valve:\u003c\/strong\u003e 23mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust valve:\u003c\/strong\u003e 20mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake port:\u003c\/strong\u003e 20.8mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust port:\u003c\/strong\u003e 18.7mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve stem length:\u003c\/strong\u003e 64mm (short style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 89.3cc (41.4mm stock stroke) \/ 94.9cc (44mm stroker)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Naraku\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eEngine Codes\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6 50cc 4-stroke\u003c\/td\u003e\n\u003ctd\u003e139QMB, QMB139\u003c\/td\u003e\n\u003ctd\u003eEngines with the 64mm short-valve head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eCheck the engine code stamped on your engine case before ordering. Engines marked 139QMB may use this kit, but confirm your original head uses 64mm short-style valves. The 52.4mm sleeve may require machining the engine case for clearance.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cp\u003eA big bore kit adds fuel and airflow demand. Plan to rejet or upgrade your carburetor and retune your variator rollers and clutch springs for the best results.\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964511617345,"sku":"137-4","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/450236.jpg?v=1792945394"},{"product_id":"athena-476mm-vertical-minarelli-cylinder-kit","title":"Athena 47.6mm Vertical Minarelli Cylinder Kit","description":"Athena 47.6mm Air Cooled Vertical Minarelli\/Yamaha Zuma Big Bore Cylinder and Head Kit. Kit includes cylinder, cylinder head, piston, ring, piston pin, cir clips, head gasket, base gasket, exhaust gasket and carbon fiber reeds.\u003cbr\u003e \u003cp\u003eWhen you use this Athena 47.6mm Big Bore Kit you will increase your total displacement to 70cc!\u003cbr\u003e\u003cbr\u003eFits \"Pre-Bug Eye\" Zuma (1989-1990, 1997-2001)\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan\u003e*You may need to modify your engine case to accommodate the larger cylinder.\u003c\/span\u003e\u003c\/p\u003e\u003cul\u003e \n\n\u003cli\u003eUpgrades to 70cc  \n\n\u003c\/li\u003e\n\u003cli\u003eAluminum Construction with Nickel Carbide Plated Bore  \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Bore: 47.6mm  \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder  Sleeve Outer Diameter: 50.75mm    \n\n\u003c\/li\u003e\n\u003cli\u003eWrist Pin Diameter: 10mm  \n\n\u003c\/li\u003e\n\u003cli\u003eTotal Piston Height: 48mm  \n\n\u003c\/li\u003e\n\u003cli\u003eCompression Height (from center of wrist pin hole to top edge of piston): 26mm\u003c\/li\u003e\n\u003cli\u003eIncludes Carbon Fiber Reeds\u003c\/li\u003e\n\u003c\/ul\u003eYamaha\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":67964513485121,"sku":"135-3","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/135-3_8816f397-42ba-40bd-91f8-5479d0a7b983.webp?v=1792993047"},{"product_id":"pinasco-cylinder-kit-1777cc-vnx-stella-2t","title":"Pinasco Cylinder Kit (177.7cc); VNX, Stella 2t","description":"\u003cp\u003eThe ONLY aluminum cylinder available for 125\/150 engines. Slightly less power than the Polini, but better heat dissipation and more reliable. The supplier recommends this kit for daily drivers and touring bikes. \u003c\/p\u003e\u003cp\u003eA Prima pipe is perfect for bringing out the power this kit can generate. Another popular upgrade is a 24\/24 or 26\/26 carb.\u003c\/p\u003e\u003cp\u003eReplacement pistons can be purchased here.\u003c\/p\u003e\u003cp\u003eReplacement rings can be purchased here.\u003c\/p\u003e\u003cp\u003eReplacement gasket can be purchased here.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\u003cp\u003eThis performance cylinder kit was designed to allow the best cooling characteristics possible. In order to do so, the manufacturer has created a specific layout of the cooling fins. On some applications, the cooling fins at the base of the cylinder come in contact with the flywheel. When this occurs, the fins must be ground off to allow clearance. Removing these fins will not hinder the cooling abilities of the cylinder nor will they subject the cylinder to premature failure. A simple grinding bit will work well for removal.\u003c\/p\u003e\u003cp\u003eCaution! When removing excess material, be very cautious. Any damage or modification to the cylinder is the sole responsibility of you, the owner.\u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution controlled vehicles. Check local laws before installing.\u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Pinasco","offers":[{"title":"Default Title","offer_id":67964519153985,"sku":"PINCK2","price":368.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6021-0-pinck2_fc973b3c-e62e-4933-8e23-f3ed58cdf0f5.jpg?v=1792557755"},{"product_id":"universal-parts-gy6-150cc-574mm-cylinder-kit","title":"Universal Parts GY6 150cc 57.4mm Cylinder Kit","description":"Universal Parts 57.4mm Stock Cylinder Kit for 150cc GY6 4-stroke engines. Includes cylinder, piston, pin, circlips, rings, head gasket, base gasket and chain tensioner gasket.\u003cul\u003e \n\n\u003cli\u003eBore: 57.4mm \n\n\u003c\/li\u003e\n\u003cli\u003eOverall Height: 90mm   \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Sleeve Outer Diameter: 60.7mm\u003c\/li\u003e\n\u003cli\u003ePiston Pin Diameter: 15mm\u003c\/li\u003e\n\u003cli\u003ePiston Pin Length: 42mm\u003c\/li\u003e\n\u003c\/ul\u003eGY6 QMI\/QMJ 152\/157, Various unlisted makes\/models","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":67964520366401,"sku":"164-308","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452764_eeb7dca8-fc11-44e3-b666-74c2c3fb68dc.jpg?v=1792945453"},{"product_id":"hoca-morini-47mm-big-bore-cylinder-kit","title":"SSP-G Morini 47mm Big Bore Cylinder Kit","description":"SSP-G 47mm Big Bore Cylinder Kit for Morini AD50 engines commonly found on Hyosung, Suzuki and TGB Street Scooters.\u003cbr\u003e \u003cp\u003eIncludes cylinder, cylinder head, head gasket, base gasket, exhaust gasket, piston, piston pin, piston rings and cir clips. \u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e \u003cp\u003eThe Moto Morini TGB Suzuki style 50cc engine is a horizontal, single-cylinder, 2 stroke, air cooled, reed valve configuration engine. The displacement is 49cc. This engine has a bore of 41mm and a stroke of 37.4mm. The transmission is a V-belt stepless automatic transmission. This engine can be started by either electric or kick start. \u003c\/p\u003e \u003cp\u003eThe Moto Morini and Franco Morini engines are used by numerous manufacturers including Aprilia, Italjet, KTM. Malaguti and many others. Some of these include the Benelli 491 ST, Derbi Vamos, Italjet Formula 50, Italjet Formula 50 LC, Italjet Torpedo 50, Italjet Velocifero 50, Malaguti Crosser CR1, the TGB\/Peirsport engines Peirspeed Bolero, Peirspeed Delivery, Peirspeed Key Largo, Peirspeed Key West, Peirspeed Laser R5, Peirspeed Laser R9, Peirspeed Outback, Peirspeed R50X, Peirspeed RM50, Peirspeed Sunset, Suzuki Address 50, Suzuki AP50, Suzuki AZ50, Suzuki Hi-Up, Suzuki Lets II, Suzuki Mollet 50, Suzuki SJ50-QT, Suzuki Sepia 50, Suzuki Sepia ZZ, Suzuki Street Magic, Suzuki TR50, Suzuki Verde, Suzuki ZZ and others...\u003c\/p\u003e\u003cul\u003e \n\n\u003cli\u003eBore: 47mm  \n\n\u003c\/li\u003e\n\u003cli\u003eOverall Height (cylinder): 78.5mm  \n\n\u003c\/li\u003e\n\u003cli\u003ePiston Pin Outer Diameter: 10mm  \n\n\u003c\/li\u003e\n\u003cli\u003eOverall Piston Height: 46mm  \n\n\u003c\/li\u003e\n\u003cli\u003ePiston Compression Height: 19mm  \n\n\u003c\/li\u003e\n\u003cli\u003eExhaust Bolt Hole Spacing: 48mm\u003c\/li\u003e\n\u003c\/ul\u003eMorini 50cc,  2-stroke\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"SSP-G","offers":[{"title":"Default Title","offer_id":67964522201409,"sku":"185-10","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452979.jpg?v=1792945457"},{"product_id":"hoca-50mm-dio-sr-performance-cylinder-kit","title":"SSP-G 50mm Dio SR Performance Cylinder Kit","description":"\u003cp\u003eUsing the SSP-G 50mm Big Bore Cylinder Set in conjunction with your stock 41.4mm crankshaft on your 50cc Honda, Kymco, Daelim, or SYM  increases your total displacement to 81.3cc! Does not work with earlier model Honda AF05e engines. See compatibility table to ensure this product fits your ride. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e You may need to modify your engine case to accommodate the larger cylinder.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIncludes cylinder, piston, rings, piston pin, circlips, head gasket, base gasket and exhaust gasket\u003c\/li\u003e\n\u003cli\u003eUpgrades to 81.3cc\u003c\/li\u003e\n\u003cli\u003eCylinder Bore: 50mm\u003c\/li\u003e\n\u003cli\u003eCylinder Sleeve Outer Diameter: 54.2mm\u003c\/li\u003e\n\u003cli\u003eWrist Pin Diameter: 12mm\u003c\/li\u003e\n\u003cli\u003eTotal Piston Height: 56mm\u003c\/li\u003e\n\u003cli\u003eCompression Height (from center of wrist pin hole to top edge of piston): 31.5mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda Dio\/Elite S AF16 (1994-2001)\u003c\/td\u003e\n\u003ctd\u003eHonda Dio\/Elite SE AF16 (1994-2001)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda Dio\/Elite SR AF16 (1994-2001)\u003c\/td\u003e\n\u003ctd\u003eKymco ZX50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKymco Fever\u003c\/td\u003e\n\u003ctd\u003eKymco DD50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDaelim Cordi 50 \u003c\/td\u003e\n\u003ctd\u003eSYM DD50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e This product is not compatible with earlier model Honda AF05e engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout SSP-G:\u003c\/strong\u003e AZScooterParts is the exclusive distributor of SSP-G Performance Parts! All SSP-G parts are sourced from top manufacturers in Taiwan for the best combination of performance, quality and cost.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"SSP-G","offers":[{"title":"Default Title","offer_id":67964523839809,"sku":"169-390","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452598_a81abe76-bfad-483f-a593-d37a219ea384.jpg?v=1792945459"},{"product_id":"cylinder-kit-pinasco-vespa-50-100cc","title":"Cylinder Kit, Pinasco - Vespa 50 (100cc)","description":"\u003cp\u003ePinasco brand cylinder kit to raise your Vespa 50 to 100cc! The supplier recommends careful tuning .\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings can be found here.\u003c\/p\u003e\n\n\u003cp\u003eReplacement pistons can be found here.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\n\n\u003cp\u003eNot legal for use in California on pollution controlled vehicles. Check local laws before installing.\u003c\/p\u003e \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Pinasco","offers":[{"title":"Default Title","offer_id":67964527804737,"sku":"PINCK4","price":274.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6178-0-PINCK4_9bb5fccd-f1db-4718-97b4-1bd2f636e099.jpg?v=1792557765"},{"product_id":"malossi-mhr-cyl-kit-buddy-50-yamaha-vino-etc","title":"Malossi MHR 70cc Cylinder Kit - Minarelli Horizontal 2T","description":"\u003cp\u003eThe Malossi MHR cylinder kit is a 70cc big-bore top-end kit for air-cooled horizontal Minarelli 2-stroke engines. This is a replica of the cylinder Malossi uses on its own racing team — Nikasil-lined aluminum cylinder for reduced friction and superior heat dissipation, paired with an HTSR aluminum cylinder head and a 47mm Asso forged piston. Fits Genuine Buddy 50, Roughhouse 50\/Sport, Yamaha Jog, Zuma 50, and Vino 50 2T. Made in Italy.\u003c\/p\u003e\u003cp\u003eReplacement pistons (10mm wrist pin) and piston rings are available separately.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e70cc displacement — up from stock 50cc\u003c\/li\u003e\n\u003cli\u003eNikasil-lined aluminum cylinder for reduced friction and heat dissipation\u003c\/li\u003e\n\u003cli\u003eHTSR aluminum cylinder head (Malossi racing spec)\u003c\/li\u003e\n\u003cli\u003e47mm Asso forged aluminum piston\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin with needle bearing\u003c\/li\u003e\n\u003cli\u003eIncludes 2 piston rings, circlip, base gasket, and head gasket\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Malossi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e70cc displacement — up from stock 50cc\u003c\/li\u003e\n\u003cli\u003eNikasil-lined aluminum cylinder for reduced friction and heat dissipation\u003c\/li\u003e\n\u003cli\u003eHTSR aluminum cylinder head (Malossi racing spec)\u003c\/li\u003e\n\u003cli\u003e47mm Asso forged aluminum piston\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin with needle bearing\u003c\/li\u003e\n\u003cli\u003eIncludes 2 piston rings, circlip, base gasket, and head gasket\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Malossi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 70cc\u003c\/li\u003e\n\u003cli\u003eBore: 47mm\u003c\/li\u003e\n\u003cli\u003eWrist Pin: 10mm\u003c\/li\u003e\n\u003cli\u003eCylinder: Nikasil-lined aluminum\u003c\/li\u003e\n\u003cli\u003eHead: HTSR aluminum (Malossi racing spec)\u003c\/li\u003e\n\u003cli\u003ePiston: 47mm Asso forged aluminum\u003c\/li\u003e\n\u003cli\u003eKit Includes: Cylinder, HTSR head, 47mm piston, 10mm wrist pin, needle bearing, 2 piston rings, circlip, base gasket, head gasket\u003c\/li\u003e\n\u003cli\u003eEngine Type: Air-cooled horizontal Minarelli 2-stroke\u003c\/li\u003e\n\u003cli\u003eOrigin: Italy\u003c\/li\u003e\n\u003cli\u003eMalossi Part No.: M318437\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eRoughhouse 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eRoughhouse 50 Sport\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eJog 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eZuma 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eVino 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003eAir-cooled horizontal Minarelli 2-stroke 50cc engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eNot intended for use on public roads or land.\u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Brand not specified","offers":[{"title":"Default Title","offer_id":67964530065729,"sku":"M 318437","price":343.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/M318437_a3e65fbd-4a79-4682-beef-97b76ef645d0.jpg?v=1792945400"},{"product_id":"universal-parts-minarelli-47mm-big-bore-cylinder-kit","title":"Universal Parts Minarelli 47mm Big Bore Cylinder Kit","description":"\u003cp\u003eBump your Minarelli-powered 50cc scooter up to 68cc with the \u003cstrong\u003eUniversal Parts 47mm Big Bore Cylinder Kit\u003c\/strong\u003e. Designed for the horizontal 1PE40QMB Jog-style engine, this complete kit includes everything needed for the swap — cylinder, piston, pin, rings, circlips, head gasket, and base gasket.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eUpgrades displacement from 50cc to 68cc (based on stock 39.2mm stroke)\u003c\/li\u003e\n\u003cli\u003eComplete kit — cylinder, piston, 12mm pin, circlips, rings, head gasket, and base gasket included\u003c\/li\u003e\n\u003cli\u003eHorizontal engine orientation (Jog\/Minarelli style)\u003c\/li\u003e\n\u003cli\u003eDirect fitment for 1PE40QMB engine platform\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Pin:\u003c\/strong\u003e 12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 87mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Sleeve Outer Diameter:\u003c\/strong\u003e 50.9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrientation:\u003c\/strong\u003e Horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgraded Displacement:\u003c\/strong\u003e ~68cc (stock 39.2mm stroke)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMinarelli 1PE40QMB horizontal 2-stroke 50cc engine (Jog-style)\u003c\/li\u003e\n\u003cli\u003eYamaha Jog 50, Yamaha Zuma 50 (2-stroke), Yamaha Vino 50 (2-stroke)\u003c\/li\u003e\n\u003cli\u003eOther horizontal Minarelli-based 50cc 2-stroke scooters with 12mm piston pins\u003c\/li\u003e\n\u003c\/ul\u003e\u003cblockquote\u003e\n\u003cspan\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eEngine case modification may be required to accommodate the larger cylinder diameter. Verify clearances before installation. Verify small end of the crank accepts 12mm piston pin\u003c\/span\u003e\n\u003c\/blockquote\u003e\u003ch2\u003eAbout Universal Parts\u003c\/h2\u003e\u003cp\u003eUniversal Parts is a trusted supplier of aftermarket scooter performance and replacement components, offering reliable, well-priced solutions for a wide range of engine platforms and makes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThis product is intended for off-road use only. Not intended for use on public roads. Not legal for use in California.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":67964531999041,"sku":"161-227","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/161-227_cfb711b3-0976-43df-aabc-78e08bf8fd35.webp?v=1792993051"},{"product_id":"hoca-50mm-qmb139-performance-cylinder-kit","title":"SSP-G 50mm QMB139 Performance Cylinder Kit","description":"\u003cp\u003eSSP-G 50cc QMB139 4-stroke 50mm, Racing Big Bore Cylinder Set. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket. \n\n\u003cbr\u003e \n\n\u003cbr\u003e \n\nPerformance items are not returnable.  \n\n\u003cbr\u003e \n\n\u003cbr\u003e \n\n  \n\n\u003c\/p\u003e\u003cp\u003e \n\n  \u003cspan\u003eThe supplier recommends that you use the QMB139 performance cylinder head (see Related Items) with this set as some stock cylinder heads will not fit. Use with an un-modified stock head can cause serious engine damage.\u003c\/span\u003e    \n\n\u003c\/p\u003e \n\n\u003cp\u003e \n\n  \u003cspan\u003e*You may need to modify your engine case to accommodate the larger cylinder.\u003c\/span\u003e \n\n\u003c\/p\u003e\u003cspan\u003eThe supplier recommends that you use the QMB139 performance cylinder head (see Related Items) with this set as some stock cylinder heads will not fit.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e \n\n\u003cul\u003e \n\n\u003cli\u003eUpgrades to 80cc  \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Bore: 50mm \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder  Sleeve Outer Diameter: 54.9mm   \n\n\u003c\/li\u003e\n\u003cli\u003eWrist Pin Diameter: 13mm  \n\n\u003c\/li\u003e\n\u003cli\u003eTotal Piston Height: 34.8mm  \n\n\u003c\/li\u003e\n\u003cli\u003eCompression Height (from center of wrist pin hole to top edge of piston): 18.3mm\u003c\/li\u003e\n\u003c\/ul\u003eBaja SC50-P, Jalon X8 Retro 50cc, Lifan, Panterra Fusion 50cc, Qingqi QM50QT-4G, Qingqi QM50QT-6V, SUNL, Schwinn, Strada, Various unlisted makes\/models","brand":"SSP-G","offers":[{"title":"Default Title","offer_id":67964545564993,"sku":"169-54","price":121.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/452040.jpg?v=1792945431"},{"product_id":"big-bore-cylinder-kit-w-head-72cc-13mm-pin-qmb139","title":"Blue Line Big Bore Kit w\/ Head 4T (72cc, 64mm Valves); 139QMB","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eBlue Line Complete 72cc High-Performance Big Bore Cylinder Kit for 50cc 4-stroke 139QMB engines.\u003c\/p\u003e\u003cp\u003eOriginal Parts For Scooters SKU 151-280-47mm\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTE: \u003c\/strong\u003eBefore ordering, remove the valve from your scooter's head and measure the full length of the valve stem. This kit works with 64mm valves. If your scooter has 69mm valves, you'll need the following 69mm big bore kit.\u003c\/p\u003e\u003cp\u003ePump up that weak engine to a respectable 72cc displacement, on a budget. This kit is not intended to make your scoot a screaming race machine. It is intended to get you that extra power you need. (Most Chinese 50cc's only put down around 1.5hp to the ground.)\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1 - Head Assembly with 64mm valves\u003c\/li\u003e\n\u003cli\u003e1 - Iron Cylinder with 47mm bore\u003c\/li\u003e\n\u003cli\u003e1 - Piston with Rings (Not Pictured)\u003c\/li\u003e\n\u003cli\u003e1 - Wrist Pin \u003c\/li\u003e\n\u003cli\u003e2 - Circlips\u003c\/li\u003e\n\u003cli\u003e2 - Exhaust studs\u003c\/li\u003e\n\u003cli\u003e2 - Intake Studs\u003c\/li\u003e\n\u003cli\u003e1 - Base Gasket\u003c\/li\u003e\n\u003cli\u003e1 - Head Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e139QMB-based 50cc \/ 80cc engines with the following engine codes:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e139QMA\u003c\/td\u003e\n\u003ctd\u003e139QMB\u003c\/td\u003e\n\u003ctd\u003e1P39QMB\u003c\/td\u003e\n\u003ctd\u003e1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYN139QMB\u003c\/td\u003e\n\u003ctd\u003eJJ1P39QMB\u003c\/td\u003e\n\u003ctd\u003e139FMA-2\u003c\/td\u003e\n\u003ctd\u003eBD1P39QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBN139QMB\u003c\/td\u003e\n\u003ctd\u003e147QMD\u003c\/td\u003e\n\u003ctd\u003eOther QMA models\u003c\/td\u003e\n\u003ctd\u003eOther QMB models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cspan\u003eDon't see your engine listed? If the engine code includes \"QM\" or \"FM\", this product is compatible with your vehicle.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout Blue Line:\u003c\/strong\u003e Blue Line offers OEM equivalent replacement parts for on-road scooters. Blue Line parts are a direct-fit replacement when OEM parts are unavailable or overly expensive for your scooter. Since 2018, Blue Line has provided quality parts at great prices.\u003c\/p\u003e\u003ch2\u003eProduct Diagrams\u003c\/h2\u003e\u003cul class=\"az-content-resources\"\u003e\u003cli\u003e\n\u003ca href=\"\/search?view=az-assembly\u0026amp;q=72\"\u003eGO MAX CYLINDER CRANKSHAFT\u003c\/a\u003e \u003cspan\u003eCallout 13\u003c\/span\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"BLUE LINE","offers":[{"title":"Default Title","offer_id":67964553298241,"sku":"1100-1439","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6896-0-1100-1439_07c09516-58c3-4fca-b4a1-a673588c7138.jpg?v=1792557837"},{"product_id":"cylinder-kit-81cc-iron-gy6-49cc-qmb139-ncy-brand","title":"NCY 50mm Big-Bore Cylinder Kit - 139QMB 50cc to 81cc","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003eNCY big-bore cylinder kit\u003c\/strong\u003e is the displacement upgrade for compatible 139QMB \/ QMB139 four-stroke scooters, taking the original 50cc platform to \u003cstrong\u003e81cc with a 50mm bore and the standard crankshaft stroke\u003c\/strong\u003e. Give your scooter more go with a cast-iron cylinder and matching piston assembly built for your next performance project. This is a big-bore conversion, not a standard-bore replacement, and the cylinder head is not included.  No case cutting required!\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Displacement:\u003c\/strong\u003e A 50mm bore produces 81cc using the standard stroke, without requiring a stroker crankshaft to achieve that displacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e139QMB Performance Upgrade:\u003c\/strong\u003e A bolt-on cylinder upgrade for matching GY6 50 \/ 139QMB four-stroke builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast-Iron Cylinder:\u003c\/strong\u003e Replacement cylinder with cooling fins for the air-cooled engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched Piston Components:\u003c\/strong\u003e Includes piston, piston rings, wrist pin and retaining clips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Set Included:\u003c\/strong\u003e Head and base gaskets accompany the cylinder and piston components.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NCY\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 1100-1237\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 603C02GY650\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit type:\u003c\/strong\u003e Big-bore cylinder conversion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine platform:\u003c\/strong\u003e 139QMB \/ QMB139, GY6 50 four-stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 50mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 81cc with standard stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder:\u003c\/strong\u003e Cast iron, air-cooled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Cylinder, piston, rings, wrist pin, retaining clips, head gasket and base gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder head:\u003c\/strong\u003e Not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eCompatible with 139QMB \/ QMB139 (GY6 50) four-stroke scooters being converted from the original 50cc configuration to a 50mm big-bore setup.\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHead compatibility matters:\u003c\/strong\u003e Most stock cylinder heads will not fit this kit. The supplier recommends the NCY 50mm big-valve performance cylinder head, 1100-1239, sold separately. Confirm the installed engine configuration and matching head before assembly.\u003c\/p\u003e\u003ch3\u003eRecommended Performance Pairings\u003c\/h3\u003e\u003cp\u003ePair the kit with the NCY Performance Camshaft, 1100-1250, sold separately, to help the bigger cylinder reach its full performance potential. The original performance pairing targets 50–55 MPH; actual speed depends on the complete engine, tuning, gearing, rider load and riding conditions, rather than the cylinder kit alone.\u003c\/p\u003e\u003cp\u003eThe supplier recommends the NCY Oil Decompression Tube Assembly, 1100-1282, sold separately. It replaces the dipstick and allows excess crankcase pressure to be released, making it a useful companion to a cylinder-kit upgrade.\u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eProduct Diagrams\u003c\/h2\u003e\u003cul class=\"az-content-resources\"\u003e\u003cli\u003e\n\u003ca href=\"\/search?view=az-assembly\u0026amp;q=72\"\u003eGO MAX CYLINDER CRANKSHAFT\u003c\/a\u003e \u003cspan\u003eCallout 13\u003c\/span\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":67964554805569,"sku":"1100-1237","price":129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/1100-1237_81c9ea5e-2ef8-4198-b556-c5ba8ef1baa1.jpg?v=1792993066"},{"product_id":"cylinder-kit-88cc-cast-52mm-qmb139-gy6-150cc-50-ncy-brand","title":"NCY 88cc Big Bore Kit (52mm) - 139QMB \/ GY6 50","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003ch2\u003eNCY 52mm 88cc Big Bore Kit - Extreme Power for QMB139 Engines\u003c\/h2\u003e\u003cp\u003eTurn your 49cc\/50cc scooter into a high-performance machine with the \u003cstrong\u003eNCY 88cc Big Bore Kit\u003c\/strong\u003e. This 52mm cast iron cylinder is designed for riders who demand the maximum displacement possible from the 139QMB platform. Engineered for durability and high-heat tolerance, this kit provides a massive boost in torque and top-end speed.\u003c\/p\u003e\u003ch3\u003ePerformance Highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Displacement:\u003c\/strong\u003e Increases your engine to a true 88cc for superior hill climbing and acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast Iron Durability:\u003c\/strong\u003e Provides excellent longevity and reliability for daily commuting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Honing:\u003c\/strong\u003e Optimized cylinder walls for reduced friction and improved ring seating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional Grade:\u003c\/strong\u003e The preferred choice for \"screamer\" builds across the scooter racing community.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDetailed Model Fitment\u003c\/h3\u003e\u003cp\u003eThis kit fits nearly all \u003cstrong\u003e4-stroke 50cc (QMB139 \/ GY6 50)\u003c\/strong\u003e scooter engines. Below are the most popular compatible models:\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eCompatible Models\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKymco\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAgility 50, Like 50, Super 8 50, People 50 (4T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTaoTao\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eATM50-A1, Pony 50, Thunder, VIP Future Champion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLance \/ SYM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCali Classic 50, Havana 50, PCH 50, SYM Fiddle II 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIce Bear \/ Wolf\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMaddog 50 (Gen I-V), Wolf RX-50, Wolf Lucky, Islander\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cblockquote\u003e\n\u003cstrong\u003eCRITICAL INSTALLATION NOTE:\u003c\/strong\u003e This is a 52mm kit. Most 139QMB engine cases \u003cstrong\u003erequire machining or cutting\u003c\/strong\u003e to fit the larger cylinder skirt. The supplier recommends using the \u003cstrong\u003eNCY Engine Bore Tool\u003c\/strong\u003e \u003cspan\u003eOrder part number \u003c\/span\u003e1400-1001 if you do not have access to a machine shop.\u003c\/blockquote\u003e\u003ch3\u003eRecommended Support Mods\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig Valve Head:\u003c\/strong\u003e Use with the NCY 50mm Big Valve Head for optimal flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankcase Pressure:\u003c\/strong\u003e Install an \u003cstrong\u003eNCY Decompression Tube\u003c\/strong\u003e to manage increased engine pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJetting:\u003c\/strong\u003e Carburetor re-jetting is required (Typically #85-#95 Main Jet depending on altitude).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e*Not legal for use in California on pollution-controlled vehicles. For off-road\/track use only.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003eNCY GY6 50\/139QMB 52mm Cast Iron Cylinder Kit w\/o head\u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eAgility 50, Like 50, Super 8 50, People 50 (4T). ATM50-A1, Pony 50, Thunder, VIP Future Champion. Cali Classic 50, Havana 50, PCH 50, SYM Fiddle II 50. Maddog 50 (Gen I-V), Wolf RX-50, Wolf Lucky, Islander.\u003c\/p\u003e\u003ch2\u003eProduct Diagrams\u003c\/h2\u003e\u003cul class=\"az-content-resources\"\u003e\u003cli\u003e\n\u003ca href=\"\/search?view=az-assembly\u0026amp;q=72\"\u003eGO MAX CYLINDER CRANKSHAFT\u003c\/a\u003e \u003cspan\u003eCallout 13\u003c\/span\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":67964557623617,"sku":"1100-1248","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6807-0-1100-1248_a695e1d5-c1fb-4bf5-b035-f866f44a954b.jpg?v=1792557842"},{"product_id":"cylinder-assembly-150-sprint-3-port-vespa","title":"Cylinder Assembly (150 Sprint, 3-port Vespa)","description":"\u003cp\u003eTutti Ricambi Vintage Vespa 150cc 3-Port Cylinder Assembly Kit.  Fits on most Vespa 125-150cc 3-port large frame model scooters. \u003c\/p\u003e\u003cp\u003eNice bolt on upgrade from a 125cc cylinder.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCylinder - 3 port\u003c\/li\u003e\n\u003cli\u003ePiston - 57.8mm\u003c\/li\u003e\n\u003cli\u003eRings - Set of 2\u003c\/li\u003e\n\u003cli\u003eWrist pin diameter - 15mm\u003c\/li\u003e\n\u003cli\u003eWrist Pin with 2 wrist pin clips\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eYou're gonna need a base gasket (part number 122790) an exhaust gasket (part number 58498), 8mm studs (part number 0500-1036) and 8mm nuts (0500-1037), so you might as well add them to your cart now.\u003c\/p\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eVespa GT125 - VNL\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eVespa GTR125 - VNL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eVespa PX125 - VNX\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eVespa P125X - VNX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa PX125E - VNX\u003c\/td\u003e\n\u003ctd\u003eVespa PX150 - VLX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa Sprint 150 - VLB\u003c\/td\u003e\n\u003ctd\u003eVespa PX150E - VLX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cb\u003eAbout Tutti Ricambi:\u003cspan\u003e  \u003c\/span\u003e\u003c\/b\u003eTutti Ricambi provides OEM-equivalent replacement components for vintage scooters. Tutti Ricambi parts serve as direct-fit alternatives when original equipment manufacturer parts are either unavailable or prohibitively priced. Since 2016, Tutti Ricambi has been delivering high-quality vintage scooter parts at competitive prices, ensuring optimal value for customers.\u003c\/p\u003e","brand":"Tutti Ricambi","offers":[{"title":"Default Title","offer_id":67964560605505,"sku":"122826","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7096-0-122826_1e72df9c-f443-4300-b7d0-730b7aa325be.jpg?v=1792557845"},{"product_id":"malossi-cylinder-kit-et2","title":"Malossi 70cc Big Bore Cylinder Kit - Vespa Piaggio ET2 50","description":"\u003cp\u003eUnlock significant power gains with the Malossi 70cc Cast Iron Big Bore Cylinder Kit for Vespa ET2 and Piaggio 50cc 2-stroke air-cooled engines. Engineered in Italy, this kit delivers the ideal balance between high-performance output and long-term daily reliability — increasing torque and top-end speed without sacrificing durability. Malossi's precision-optimized transfer ports, exhaust timing, and combustion chamber geometry produce high turbulence for better fuel efficiency and reduced exhaust emissions. SKU: M 316926.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e70cc displacement — significant power increase over stock 50cc\u003c\/li\u003e\n\u003cli\u003eSpecialized laminate cast iron construction for maximum component life\u003c\/li\u003e\n\u003cli\u003eRecalculated heat exchange surfaces for superior temperature management\u003c\/li\u003e\n\u003cli\u003eLightened and reinforced high-silicon aluminum alloy piston for reduced friction\u003c\/li\u003e\n\u003cli\u003eHigh-turbulence combustion chamber for maximum efficiency and reduced emissions\u003c\/li\u003e\n\u003cli\u003eNC machine-tool finished for precision tolerances\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Malossi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 70cc\u003c\/li\u003e\n\u003cli\u003eBore: 47mm\u003c\/li\u003e\n\u003cli\u003eMaterial: Laminate cast iron\u003c\/li\u003e\n\u003cli\u003ePiston pin: 12mm\u003c\/li\u003e\n\u003cli\u003eMachining: NC machine-tool finished\u003c\/li\u003e\n\u003cli\u003eEngine type: 50cc 2-stroke air-cooled Piaggio\u003c\/li\u003e\n\u003cli\u003eSKU: M 316926\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eCompatible Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eET2 (all years), LX 50 (2-stroke), S 50 (2-stroke)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiaggio\u003c\/td\u003e\n\u003ctd\u003eTyphoon 50 (2007–2010), LT 50 (all years), Fly 50 (2-stroke)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAprilia\u003c\/td\u003e\n\u003ctd\u003eSR50 Motard (Piaggio engine models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Not legal for use in California on pollution-controlled vehicles. Intended for off-road and racing use only. Check local laws before installing.\u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964561948993,"sku":"M 316926","price":260.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/1_malossi.jpg?v=1792793696"},{"product_id":"prima-cylinder-kit-aluminum-585mm-161cc-buddy-125-only","title":"NCY Genuine Buddy 125 Big Bore Kit - No Case Cut 161cc","description":"\u003cp\u003eUnlock serious performance from your Genuine Buddy 125 with this 161cc big bore cylinder kit made by NCY. Displacing 161cc via a 58.5mm bore, this bolt-on upgrade delivers up to a 36% increase in horsepower over the stock 125cc configuration — all with a complete gasket set and hardware included for a clean, straightforward install.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote: For off-road use only. Fits Genuine Buddy 125 exclusively. Wrist pin: 13mm.\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e58.5mm bore — increases displacement from 125cc to 161cc\u003c\/li\u003e\n\u003cli\u003eUp to 36% more horsepower over stock\u003c\/li\u003e\n\u003cli\u003eCast iron cylinder for durability and heat dissipation\u003c\/li\u003e\n\u003cli\u003eCast aluminum piston for reduced reciprocating weight\u003c\/li\u003e\n\u003cli\u003e13mm wrist pin with circlips included\u003c\/li\u003e\n\u003cli\u003eComplete gasket set included (head gasket, base gasket, exhaust gasket)\u003c\/li\u003e\n\u003cli\u003ePiston rings included\u003c\/li\u003e\n\u003cli\u003eBolt-on fitment — no case machining required\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBore: 58.5mm\u003c\/li\u003e\n\u003cli\u003eDisplacement: 161cc\u003c\/li\u003e\n\u003cli\u003eWrist Pin: 13mm\u003c\/li\u003e\n\u003cli\u003eCylinder Material: Cast Iron\u003c\/li\u003e\n\u003cli\u003ePiston Material: Cast Aluminum\u003c\/li\u003e\n\u003cli\u003eKit Includes: Cylinder, piston, wrist pin, circlips, piston rings, full gasket set\u003c\/li\u003e\n\u003cli\u003eWeight: 5.19 lbs\u003c\/li\u003e\n\u003cli\u003eDimensions: 11\" L x 6\" W x 6\" H\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 125\u003c\/td\u003e\n\u003ctd\u003eAll years\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Prima","offers":[{"title":"Default Title","offer_id":67964574499137,"sku":"1100-1287","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6825-0-1100-1287_10e2185a-415e-4f35-9ab8-3937dcc53098.jpg?v=1792557862"},{"product_id":"cylinder-kit-aluminum-61mm-171cc-genuine-gy6-150cc-ncy-brand","title":"NCY 61mm No-Cut GY6 Big Bore Cylinder Kit - 171cc","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003eNCY 61mm aluminum big bore kit\u003c\/strong\u003e gives your compatible GY6-A 125\/150cc four-stroke build more displacement for a more spirited off-road ride. The 61 mm bore delivers approximately 171.3cc with the applicable crankshaft stroke. Its 62.99 mm outer cylinder skirt allows a no-case-cut installation on engine cases that accept that diameter, while aluminum construction supports efficient heat transfer.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore displacement:\u003c\/strong\u003e 61 mm bore for approximately 171.3cc with the applicable crankshaft stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConditional no-case-cut fit:\u003c\/strong\u003e 62.99 mm outer cylinder skirt fits compatible case openings without machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum cylinder:\u003c\/strong\u003e Supports efficient heat transfer in an air-cooled engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort-skirt piston:\u003c\/strong\u003e Reduces reciprocating mass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched kit components:\u003c\/strong\u003e Includes cylinder, piston, rings, wrist pin, clips, and gaskets.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NCY\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 1100-1288\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 603C02GY661\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 61 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e Approximately 171.3cc with the applicable crankshaft stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter cylinder skirt diameter:\u003c\/strong\u003e 62.99 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder stud spacing:\u003c\/strong\u003e 54 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine case:\u003c\/strong\u003e GY6-A block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarting engine applications:\u003c\/strong\u003e Compatible GY6 125\/150cc four-stroke QMI\/QMJ engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Cylinder, piston, rings, wrist pin, clips, and gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDoes not fit Genuine Buddy 125, GY6 B-block, 161QMK, or other QMK engines.\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eModels\/configurations\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6-A engine codes\u003c\/td\u003e\n\u003ctd\u003eMatching 157QMJ, 1P57QMJ, 152QMI, and BN157QMJ configurations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine scooters\u003c\/td\u003e\n\u003ctd\u003eBuddy 150 and Blur 150 with matching engine and case dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6 scooters\u003c\/td\u003e\n\u003ctd\u003eSelect TaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR, SYM, and other compatible QMI\/QMJ-based models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGo-karts and buggies\u003c\/td\u003e\n\u003ctd\u003eSelect Hammerhead 150, Trailmaster 150, Yerf-Dog, and Carter Talon applications with matching QMI\/QMJ engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eVerify the GY6-A case, 54 mm cylinder stud spacing, 62.99 mm skirt clearance, deck height, oil passages, cylinder-head compatibility, and piston-to-valve clearance before assembly. Engine code alone does not guarantee fitment. No-case-cut installation applies only when the case opening accepts the skirt diameter.\u003c\/p\u003e\u003ch3\u003eTuning and Installation\u003c\/h3\u003e\u003cp\u003eIncreasing displacement requires fuel-system tuning. Carbureted applications generally require re-jetting; the correct jet size depends on the carburetor, intake, exhaust, elevation, and other modifications. Professional assembly, clearance checks, break-in, and tuning are recommended.\u003c\/p\u003e\u003ch2\u003eProduct Diagrams\u003c\/h2\u003e\u003cul class=\"az-content-resources\"\u003e\u003cli\u003e\n\u003ca href=\"\/search?view=az-assembly\u0026amp;q=244\"\u003eGY6 CYLINDER\u003c\/a\u003e \u003cspan\u003eCallout 1\u003c\/span\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":67964575416641,"sku":"1100-1288","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/1100-1288_837e0f13-d892-446e-adea-4de8873ba38b.jpg?v=1792945468"},{"product_id":"cylinder-kit-polini-primavera-et3-130cc","title":"Cylinder Kit, Polini - Primavera, ET3 (130cc)","description":"This cast-iron kit has more power in the midrange and lower end than the Malossi, and is a great all-around cylinder. Highly recommended, especially for touring.\u003cp\u003eThe supplier recommends the Polini or Leo Vinci exhaust with this kit. A great 24mm carb upgrade is available too.\u003c\/p\u003e\u003cp\u003eThis kit will fit on all Primavera and ET3 scooters, and also post-1965 Vespa 90. Additionally it will fit on some Vespa 50, but the supplier recommends upgrading your gearing on 50cc engines at the same time.You will need four long cylinder studs and a Primavera shroud to use on these models.\u003c\/p\u003e\u003cp\u003eWill not fit 63-64 Vespa 90. Sorry, there is no cylinder kit available for those years!\u003c\/p\u003e\u003cp\u003eReplacement pistons can be purchased here:\u003cbr\u003eStandard size\u003cbr\u003eFirst oversize\u003cbr\u003eSecond oversize\u003c\/p\u003e\u003cp\u003eReplacement rings can be purchased here:\u003cbr\u003eStandard size\u003cbr\u003eFirst oversize\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\u003cp\u003eLooking for more performance upgrades? We also sell a Vespa 50 basic performance kit, a Primavera\/ET3 performance kit, and a Vespa 50 high performance kit that include this cylinder!\u003c\/p\u003e\"\n\n\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964587770177,"sku":"PCK3","price":500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8569-0-PCK3_69ebcda7-1cfc-405c-99bd-18e85a31e618.jpg?v=1792557916"},{"product_id":"malossi-cylinder-kit-190cc-71mm-vespa-et4-leader-engine","title":"Malossi Cylinder Kit (190cc, 71mm); Vespa ET4, LEADER Engine","description":"\u003cp\u003eMalossi 190cc, 71mm cylinder kit for Vespa ET4 150 and LX150, LXV150, and S150 scooters, and other bikes running Piaggio's Leader 125\/150cc engine. Gives you 20% more power over a stock setup.\u003c\/p\u003e\u003cp\u003eReplacement pistons are available here. Replacement rings are available here.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIncludes cylinder, piston, rings, wrist pin and circlips, gasket and jets\u003c\/li\u003e\n\u003cli\u003eBore: 70 mm\u003c\/li\u003e\n\u003cli\u003eStroke: 48.6 mm\u003c\/li\u003e\n\u003cli\u003eDisplacement 187.6cc\u003c\/li\u003e\n\u003cli\u003eComes with a cylinder head and the following carb jets: 115 main jet, BE4 atomizer, 52\/140 idle jet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa ET4 150\u003c\/td\u003e\n\u003ctd\u003eVespa LX150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa LXV150\u003c\/td\u003e\n\u003ctd\u003eVespa S150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eAbout Malossi:\u003c\/strong\u003e  Malossi proudly reflects the essence of Italian craftsmanship. The Malossi product journey begins with R \u0026amp; D where products undergo rigorous testing in racing conditions, ensuring that only products proven effective on the racetrack are deemed suitable for everyday applications.  Malossi products are manufactured robotically under the direct supervision of Malossi family artisans whose wealth of experience and expertise has been inherited through generations since 1930.\u003c\/span\u003e\u003c\/p\u003e\u003ch4\u003eThis product is intended for off-road use only.\u003c\/h4\u003e\u003ch4\u003eThis product is not intended for use on public roads or land.\u003c\/h4\u003e\u003ch4\u003eThis product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/h4\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964593471809,"sku":"M 3111393","price":424.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7988-0-M_203111393_44ed8f9d-8a40-4b1d-8841-0b4f125ef6d3.jpg?v=1792557922"},{"product_id":"malossi-mhr-cyl-kit-morini","title":"Malossi, MHR Cyl Kit; Morini","description":"\u003cp\u003eM 319477 Cylinder head Aluminum Scooter 72cc MHR Replica for Peugeot watercooled engines\u003c\/p\u003e\n\n\u003cp\u003eThese cylinder kits were designed to guarantee maximum performance in this category, while at the same time assuring extremely long product life.\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003eFor the following engines\u003c\/p\u003e\n\n\u003cp\u003e-Peugeot Scooter 50 Water-cooled vertical cylinder to 2003\u003c\/p\u003e\n\n\u003cp\u003e-Peugeot Scooter 50 Water-cooled vertical cylinder from 2004 Euro2\u003c\/p\u003e\n\n\u003cp\u003eFor the following vehicles\u003c\/p\u003e\n\n\u003cp\u003e-Peugeot SPEEDFIGHT 50 2 water-cooled rear disc brakes 1998-2003\u003c\/p\u003e\n\n\u003cp\u003e-Peugeot SPEEDFIGHT 50 2 watercooled 1998-2003 rear drum brakes\u003c\/p\u003e\n\n\u003cp\u003e-Peugeot SPEEDFIGHT 50 2 watercooled 2004-2008 Euro2 with rear disc brakes\u003c\/p\u003e\n\n\u003cp\u003eReplacment pistons can be ordered here.\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings can be ordered here.\u003c\/p\u003e \u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964594389313,"sku":"M 319477","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7992-0-M_20319477_271f0f76-f899-4ab0-aba9-573692c0b79e.jpg?v=1792557923"},{"product_id":"malossi-cylinder-kit70ccironacminarellibuddy-50-zuma50","title":"Malossi 70cc Big Bore Cylinder Kit - Genuine \/ Minarelli 2T","description":"\u003cp\u003eThis \u003cstrong\u003eMalossi 70cc Cast Iron Cylinder Kit\u003c\/strong\u003e is a complete big-bore upgrade for horizontal air-cooled Minarelli 2-stroke engines, the Yamaha Jog-based platform used in the Genuine Buddy 50, Yamaha Zuma 50, and many other 50cc scooters. Going from 50cc to 70cc gives you noticeably stronger acceleration, more torque on hills, and better overall pull. It's made in Italy and includes everything needed for a top-end swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOff-road\/racing use only.\u003c\/strong\u003e Not legal for pollution-controlled vehicles in California or on public roads.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70cc displacement:\u003c\/strong\u003e 47mm bore for a big jump over stock 50cc power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast iron cylinder:\u003c\/strong\u003e Durable, finned iron barrel for reliable air cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum head:\u003c\/strong\u003e Matched head for the larger bore.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete kit:\u003c\/strong\u003e Piston, pin, rings, circlips, gaskets, and reed petals included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in Italy:\u003c\/strong\u003e Genuine Malossi quality.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e M 317083\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate part number:\u003c\/strong\u003e 4614340\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 70cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin:\u003c\/strong\u003e 10mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Air-cooled (AC) only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder material:\u003c\/strong\u003e Cast iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead material:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Cylinder, head, piston with 2 rings, wrist pin, 2 circlips, base gasket, head O-ring, exhaust gasket, 2 reed petals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of origin:\u003c\/strong\u003e Italy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Malossi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 50, RoughHouse 50, Rattler 50, Black Cat 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eZuma 50 (2002-2011 \"Bugeye\"), Vino 50 2T, Jog 50 (horizontal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAprilia \/ Malaguti\u003c\/td\u003e\n\u003ctd\u003eScarabeo 50 2T, F-10, Yesterday\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal\u003c\/td\u003e\n\u003ctd\u003eHorizontal AC Minarelli 2-stroke with 10mm wrist pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eHorizontal Minarelli 2-stroke engines are based on the Yamaha Jog design. Confirm that your engine is air-cooled and horizontal and uses a 10mm wrist pin before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWrist pin:\u003c\/strong\u003e This kit includes a \u003cstrong\u003e10mm wrist pin\u003c\/strong\u003e piston. If your engine uses a 12mm wrist pin, order the 12mm wrist pin piston separately. Replacement 10mm pistons and piston rings are also available.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCarburetor:\u003c\/strong\u003e Up-jet your main jet 10–15% after installing this kit to avoid running lean.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBreak-in:\u003c\/strong\u003e Heat-cycle break-in required for the first 150–200 miles. Use a rich 50:1 synthetic 2-stroke mix during break-in.\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964596191553,"sku":"M 317083","price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7951-0-M_20317083_e7352dbb-32b4-42b9-b549-abfc3c24f278.jpg?v=1792557925"},{"product_id":"malossi-cylinder-kit-kymco-zx50-honda-dio","title":"Malossi, Cylinder Kit; Kymco ZX50\/ Honda DIO","description":"From the fine folks at Malossi, a 72cc cylinder kit for Kymco, Honda and Daelim\n\n\u003cp\u003eThis Malossi cylinder kit owes its performance to recalculated exhaust and transfer ports, a lightened and reinforced piston and an optimized compression ration. \u003c\/p\u003e\n\n\u003cp\u003eFor the following engines:\u003c\/p\u003e\n\n\u003cp\u003e* Daelim Scooter 50 air-cooled (Message, Tapo) \u003cbr\u003e* Scooter Kymco 50 (Honda engine - vertical cylinder)\u003c\/p\u003e\n\n\u003cp\u003eFor the following vehicles:\u003c\/p\u003e\n\n\u003cp\u003e* Daelim GZ 50 Message 1997-2002 \u003cbr\u003e * Daelim TAPO 50 \u003cbr\u003e * Honda SK 50 DIO G \u003cbr\u003e * Honda SK 50 DIO SP \u003cbr\u003e * Honda SK 50 DIO SR \u003cbr\u003e * Honda SK 50 DIO ZX \u003cbr\u003e * Kymco CX 50 1993 in front with drum brakes \u003cbr\u003e * Kymco CX 50 1994-1997 SUPER with disc brakes \u003cbr\u003e * Kymco DJ * W 1994-2000 in front with drum brakes \u003cbr\u003e * Front Kymco DJ Y 1993-2006 with drum brakes \u003cbr\u003e * Kymco K12 1995-2000 (12 inch tires) \u003cbr\u003e * Kymco KB * 1995-2000 (10-inch tires) \u003cbr\u003e* Kymco ZX SUPER FEVER II, 1999-2006\u003c\/p\u003e\n\n\u003cp\u003eReplacement pistons are available here.\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings are available here.\u003c\/p\u003e \u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964597043521,"sku":"M 317200","price":319.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7952-0-M_20317200_520a5453-94e0-4bc9-827b-82a43ef9194d.jpg?v=1792557926"},{"product_id":"malossi-cyl-kit-italjet-tgb50-mojito","title":"Malossi 65cc Sport Cylinder Kit - Morini, Suzuki \u0026 TGB 50cc","description":"\u003cp\u003eUnlock the true potential of your 50cc air-cooled Morini or Suzuki engine with the \u003cstrong\u003eMalossi 65cc Sport Cylinder Kit\u003c\/strong\u003e. This \"Sport\" series kit is world-renowned for providing a substantial increase in torque and mid-range power without sacrificing the daily reliability required for a street-driven scooter.\u003c\/p\u003e\u003cp\u003eThe cylinder is cast from high-quality wear-resistant \u003cstrong\u003elamellar cast iron\u003c\/strong\u003e, featuring recalculated transfer ports and a widened exhaust port. Combined with the included high-compression cylinder head, this kit delivers the aggressive \"Malossi power\" that enthusiasts have trusted since 1946.\u003c\/p\u003e\u003ch3\u003eKit Includes:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast Iron Cylinder:\u003c\/strong\u003e 45.5mm bore, air-cooled design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Compression Head:\u003c\/strong\u003e Specifically mapped for 65cc displacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Ring Piston:\u003c\/strong\u003e Includes 10mm wrist pin, rings, and circlips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon Fiber Reeds:\u003c\/strong\u003e Improves throttle response and intake efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Set:\u003c\/strong\u003e All necessary base and head gaskets for installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDetailed Model Fitment:\u003c\/h3\u003e\u003cp\u003eThis kit is designed for \u003cstrong\u003eAir-Cooled Morini-style\u003c\/strong\u003e engines found in:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eItaljet:\u003c\/strong\u003e Formula 50 (Air Cooled), Torpedo 50, Velocifero 50\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuzuki:\u003c\/strong\u003e AD50, Address 50, Sepia 50, Hi-Up, Street Magic (TR50)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTGB:\u003c\/strong\u003e Delivery 50, Laser 50, Key West 50, R50X\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAprilia:\u003c\/strong\u003e Habana 50 \/ Mojito 50 (1999–2003 with Morini Engine)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDerbi:\u003c\/strong\u003e Vamos 50\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 65cc (45.5mm Bore)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin:\u003c\/strong\u003e 10mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron (Cylinder) \/ Aluminum (Head)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Italy\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eSafety \u0026amp; Legal:\u003c\/strong\u003e\u003cbr\u003e• This product is intended for \u003cstrong\u003eoff-road\/racing use only\u003c\/strong\u003e.\u003cbr\u003e• Not legal for use on public roads or land.\u003cbr\u003e• \u003cstrong\u003eCalifornia Residents:\u003c\/strong\u003e Not legal for use on pollution-controlled vehicles. Check local laws before installing.\u003c\/p\u003e\u003cp\u003e\u003cem\u003e\u003cstrong\u003eTech Tip:\u003c\/strong\u003e To ensure the longevity of your new kit, the supplier recommends up-jetting your carburetor by 10-15% and using a high-quality synthetic 2-stroke oil. Proper heat-cycle \"break-in\" is required for the first 200 miles.\u003c\/em\u003e\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964597797185,"sku":"M 318723","price":265.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7953-0-M_20318723_b6ce793f-8cd5-4770-b9d0-120cddaa3eeb.jpg?v=1792557927"},{"product_id":"malossi-cylinder-kit-72-cc-cast-iron-2t-ac-kymco","title":"Malossi Cylinder Kit (72 cc, Cast Iron, 2T, AC); Kymco","description":"\u003cp\u003eThis Malossi 72cc Cylinder Kit is designed for Minarelli horizontal air-cooled engines found in Kymco bikes. See the Compatibility table below to ensure this kit works with your bike.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWorks with Minarelli horizontal air-cooled (AC) engines\u003c\/li\u003e\n\u003cli\u003eWearproof, laminate cast iron cylinder\u003c\/li\u003e\n\u003cli\u003eRecalculated heat exchange surfaces\u003c\/li\u003e\n\u003cli\u003eTransfer and exhaust designed for maximum efficiency\u003c\/li\u003e\n\u003cli\u003eLightened and reinforced, special aluminum alloy pistons with a high silicon content\u003c\/li\u003e\n\u003cli\u003eComes with a 12mm wrist pin piston\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eKymco 2T People 50\u003c\/td\u003e\n\u003ctd\u003eKymco Super 8\u003cbr\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKymco Super 9 AC\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003ePlease check your wrist pin size before ordering. This kit comes with a 12mm wrist pin piston. \u003c\/p\u003e\u003cp\u003eReplacement 12mm pistons are available here.\u003c\/p\u003e\u003cp\u003eReplacement rings are available here.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout Malossi:\u003c\/strong\u003e The leader in scooter performance! Malossi is no stranger to the scooter-racing scene and is known worldwide for their high quality, Italian-made big bore kits, variators, belts and exhaust pipes.\u003c\/p\u003e\u003ch4\u003eThis product is intended for off-road use only.\u003c\/h4\u003e\u003ch4\u003eThis product is not intended for use on public roads or land.\u003c\/h4\u003e\u003ch4\u003eThis product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/h4\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964598419777,"sku":"M 319987","price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-7954-0-M_20319987_a30fc1ad-b634-4f29-b5c6-1cea951bcf75.jpg?v=1792557928"},{"product_id":"malossi-cylinder-kit-gp1-runner-50","title":"Malossi, Cylinder Kit; GP1\/Runner 50","description":"\u003cp\u003e68cc cylinder kit for water-cooled Piaggio engines\u003c\/p\u003e\n\n\u003cp\u003e- Material: wearproof, laminate special cast iron \u003cbr\u003e- Recalculated heat exchange surfaces \u003cbr\u003e- NC machine-tool machining \u003cbr\u003e- Transfer and exhaust disigned for maximum efficiency \u003cbr\u003e- Lightened and reinforced, special aluminium alloy pistons with a high silicon content \u003cbr\u003e- Optimized compression ratio\u003c\/p\u003e\n\n\u003cp\u003eFor the following engines:\u003c\/p\u003e\n\n\u003cp\u003ePiaggio * 50 2-stroke water-cooled Scooter 1995-1999 \u003cbr\u003e Piaggio Scooter * 50 2-stroke water-cooled 1998 - (short motor housing) \u003cbr\u003e Piaggio Scooter * 50 2-stroke water-cooled 1998 - (mid-length motor housing) \u003cbr\u003ePiaggio Scooter * 50 2-stroke water-cooled 1998 - (long motor housing)\u003c\/p\u003e\n\n\u003cp\u003eFor the following vehicles:\u003c\/p\u003e\n\n\u003cp\u003e* Aprilia SR 50 2004 - watercooled (Piaggio engine) \u003cbr\u003e * Aprilia SR 50 R FACTORY (carb version) \u003cbr\u003e * Derbi GP1 50 2001-2002 \u003cbr\u003e * Derbi GP1 50 2003 \u003cbr\u003e * Derbi GP1 50 * Euro2 2005 () with chain drive \u003cbr\u003e * Derbi GP1 50 * Euro2 Race 2005-2007 () with chain drive \u003cbr\u003e * Euro2 Derbi GP1 50 Open 2006-2009 () with chain drive \u003cbr\u003e * Gilera DNA 50 2000-2002 \u003cbr\u003e * Gilera DNA GP EXPERIENCE 50 2003-2004 \u003cbr\u003e * Gilera DNA 50 2005-2007 \u003cbr\u003e * Gilera RUNNER 50 Purejet 2005-2008 RST (14 \"front wheel) \u003cbr\u003e * Gilera RUNNER 50 watercooled 1997-2000 with rear disc brakes (12 \"front wheel) \u003cbr\u003e * Gilera RUNNER 50 watercooled 1997-2000 with drum brakes and rear (12 \"front wheel) \u003cbr\u003e * Gilera RUNNER 50 watercooled 2002-2004 with rear disc brakes (12 \"front wheel) \u003cbr\u003e * Gilera RUNNER 50 watercooled 2005-2009 RST (14 \"front wheel) \u003cbr\u003e * Water-cooled Piaggio NRG 1994-1996 \u003cbr\u003e * Water-cooled Piaggio NRG 1996-1998 MC2 with rear disc brakes \u003cbr\u003e * Water-cooled Piaggio NRG 1996-1998 MC2 with rear drum brake \u003cbr\u003e * 1999-2001 Piaggio NRG EXTREME water cooled with rear disc brakes \u003cbr\u003e * Piaggio NRG MC3 watercooled 2001-2004 with rear disc brakes \u003cbr\u003e * Water-cooled Piaggio NRG 2005-2006 POWER with rear disc brakes \u003cbr\u003e * Water-cooled Piaggio NRG 2007-2009 POWER with rear disc brakes \u003cbr\u003e * Water-cooled Piaggio NTT 1995-1996 \u003cbr\u003e * Piaggio zip 50 2-stroke water-cooled 1996-1999 SP \u003cbr\u003e * Piaggio zip 50 2-stroke water-cooled 2000-2004 SP \u003cbr\u003e* 50 2-stroke Piaggio ZIP SP 2006-2009 Euro2 watercooled\u003c\/p\u003e\n\n\u003cp\u003eReplacement pistons are available here.\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings are available here.\u003c\/p\u003e \u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964601467201,"sku":"M 317353","price":281.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8880-0-m_20317353_e51e9a5c-5ab4-4b7f-b016-457cb9193fc6.jpg?v=1792557931"},{"product_id":"polini-cast-75cc-cylinder-kit-vespa-50","title":"Polini cast 75cc Cylinder Kit (Vespa 50)","description":"A good, inexpensive upgrade for those pokey Vespa 50s. Works very well with a Performance Exhaust Pipe.Or a 16\/16 carb!\n\n\u003cp\u003e\n\n\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e\n\n  \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964604350785,"sku":"140.0053-R","price":375.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8664-0-140.0053-R_3f0b7d42-53e0-4a2f-9166-02b14c2fdbd7.jpg?v=1792557935"},{"product_id":"malossi-cylinder-kit-vespa-p200","title":"Malossi, Cylinder Kit; Vespa P200","description":"\u003cp\u003ePerhaps the most popular kit for the 200cc (P, PX, and Rally 200) is all about high-RPM power. An aluminum-nikasil cylinder that many aficionados swear by. This kit will boost your displacement to 210cc, but also add better porting for added power!\u003c\/p\u003e\n\n\u003cp\u003ePerfect when mated with a Prima pipe! The 26\/26 carbs are very popular with this cylinder too. Check the the entire line of Performance Carburetors.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\n\n\u003cp\u003eReplacement pistons can be ordered here:\u003cbr\u003eA size\u003cbr\u003eC size\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings can be ordered here.\u003c\/p\u003e\n\n\u003cp\u003eLooking for more performance upgrades? We also carry a P200\/Rally 200 high performance kit that includes this cylinder!\u003c\/p\u003e \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964604383553,"sku":"MCK1","price":475.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/MCK1.webp?v=1792793657"},{"product_id":"malossi-cylinder-kit-166cc-p125-150-stella-2t","title":"Malossi 177cc Cylinder Kit - Vespa P125\/150 \/ Stella 2T","description":"\u003cp\u003eMalossi 177cc cylinder kit for vintage Vespa P125\/150-series and Genuine Stella 2T scooters. Cast iron cylinder barrel with high-RPM porting delivers strong top-end power while maintaining usable mid- and low-range response. Includes cast iron cylinder, aluminum cylinder head, aluminum piston, piston rings, wrist pin, circlips, head gasket, and carb jetting. Made in Italy by Malossi.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCast iron cylinder barrel with optimized high-RPM port layout\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder head with hemispherical combustion chamber and wave cooling fins\u003c\/li\u003e\n\u003cli\u003eFlat-crown aluminum piston with 2-ring design and rectangular transfer port windows\u003c\/li\u003e\n\u003cli\u003eStrong top-end power with minimal sacrifice in mid- and low-range response\u003c\/li\u003e\n\u003cli\u003eRecommended upgrades: Prima performance exhaust and 26\/26 carb for best results\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Malossi since 1930\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eKit Contents:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCast iron cylinder barrel\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder head\u003c\/li\u003e\n\u003cli\u003eAluminum piston with wrist pin and circlips\u003c\/li\u003e\n\u003cli\u003e2 piston rings\u003c\/li\u003e\n\u003cli\u003eHead gasket\u003c\/li\u003e\n\u003cli\u003eCarb jets: 115 main jet, BE4 atomizer, 52\/140 idle jet\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrand: Malossi\u003c\/li\u003e\n\u003cli\u003eSKU: MCK2\u003c\/li\u003e\n\u003cli\u003eDisplacement: 177cc\u003c\/li\u003e\n\u003cli\u003eCylinder material: Cast iron\u003c\/li\u003e\n\u003cli\u003eHead material: Aluminum alloy\u003c\/li\u003e\n\u003cli\u003eMade in Italy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eSprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eGTR 125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eTS 125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eP125E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003ePX125E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003eP150X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVespa\u003c\/td\u003e\n\u003ctd\u003ePX150E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eStella 2T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation note:\u003c\/strong\u003e On some applications, the cylinder cooling fins at the base may contact the flywheel. If this occurs, the affected fins must be ground off for clearance. This does not affect cooling performance or cylinder longevity. Use a grinding bit and proceed carefully — any damage from modification is the owner’s responsibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOff-road use only.\u003c\/strong\u003e Not intended for use on public roads or land. Not legal for use in California on pollution-controlled vehicles — check local laws before installing. Performance parts are not covered under warranty.\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964605235521,"sku":"MCK2","price":367.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/MCK2_e88c578a-26c9-45e9-b584-268d3f24e39a.webp?v=1792993060"},{"product_id":"malossi-cylinder-kit-1324cc-vespa-primavera","title":"Malossi, Cylinder Kit (132.4cc); Vespa Primavera","description":"This cast iron kit is set up for more power in the higher RPMs, at the expense of a little bottom-end and midrange power. Extremely high quality Malossi is known for!\u003cp\u003eA recommended carburation upgrade is the Malossi reed valve kit. The supplier recommends the Polini exhaust. \u003c\/p\u003e\u003cp\u003eThis kit will fit on all Primavera and ET3 scooters, and also post-1965 Vespa 90. Additionally, it will fit on some Vespa 50's, but the supplier recommends upgrading your gearing on 50cc engines at the same time. You will need four long cylinder studs and a Primavera shroud to use on these models.\u003c\/p\u003e\u003cp\u003eThis will not fit on '63-64 model Vespa 90 (small door models). Sorry; no cylinder kit will!\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\u003cp\u003eReplacement pistons can be ordered here:\u003cbr\u003estandard1st oversize2nd oversize\u003c\/p\u003e\u003cp\u003eReplacement rings can be ordered here.\u003c\/p\u003e\u003cp\u003eLooking for more performance upgrades? We also carry a Primavera high performance kit that inlcludes this cylinder!\u003c\/p\u003e\u003cp\u003eMalossi Part Number: 3114930\"\u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e\n\n \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964606153025,"sku":"MCK3","price":320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8010-0-mck3_c802ea61-3aec-465b-bdb5-8d76b83431bc.jpg?v=1792557937"},{"product_id":"prima-cylinder-kit-10mm-pin-72cc-minarelli-50-horizontal","title":"NCY 72cc Big Bore Kit 47mm - Buddy \/ Roughhouse \/ Zuma 50cc","description":"\u003cp\u003eUnlock more power from your 50cc 2-stroke scooter with the NCY 72cc Big Bore Kit (SKU PRCK1). Direct bolt-on upgrade for Minarelli horizontal 50cc 2-stroke engines — a noticeable bump in displacement, throttle response, and top-end pull without major modifications. Requires carburetor re-jetting after installation (larger main jet recommended).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKit Contents\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIron-bore cylinder — gray, 4-fin cooling fins, 4-bolt head pattern\u003c\/li\u003e\n\u003cli\u003eFinned aluminum performance cylinder head\u003c\/li\u003e\n\u003cli\u003e47mm flat-top forged aluminum piston\u003c\/li\u003e\n\u003cli\u003e2 piston rings\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin\u003c\/li\u003e\n\u003cli\u003e2 G-clips \/ circlips\u003c\/li\u003e\n\u003cli\u003eGreen composite base gasket\u003c\/li\u003e\n\u003cli\u003eCopper head gasket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e72cc displacement upgrade from stock 50cc\u003c\/li\u003e\n\u003cli\u003e47mm forged aluminum piston with 2 piston rings\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin with G-clips included\u003c\/li\u003e\n\u003cli\u003eFull top-end overhaul kit — everything needed for installation\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on for Minarelli 50cc horizontal 2-stroke engines\u003c\/li\u003e\n\u003cli\u003eRequires carburetor re-jetting after installation (larger main jet recommended)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 72cc\u003c\/li\u003e\n\u003cli\u003eBore: 47mm\u003c\/li\u003e\n\u003cli\u003eWrist pin: 10mm\u003c\/li\u003e\n\u003cli\u003ePiston rings: 2 included\u003c\/li\u003e\n\u003cli\u003eEngine type: 2-stroke Minarelli horizontal\u003c\/li\u003e\n\u003cli\u003eWeight: 8.0 lbs\u003c\/li\u003e\n\u003cli\u003eSKU: PRCK1\u003c\/li\u003e\n\u003cli\u003eBrand: NCY (Taiwan)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 50, RoughHouse 50, Rattler 50, Black Cat 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eJog 50, Zuma 50 (2T), Vino 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdly \u0026amp; Chinese 2T\u003c\/td\u003e\n\u003ctd\u003eMinarelli 50cc horizontal 2-stroke platforms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":67964613787969,"sku":"PRCK1","price":185.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/PRCK1_2a7e8df0-661b-4d90-a415-5c732c18e79d.jpg?v=1792793664"},{"product_id":"cylinder-kit-polini-vsx-207cc","title":"Cylinder Kit, Polini - VSX (207cc)","description":"One of the highest-output cylinders available. This cast-iron kit shines in the lower end and midrange, and can have you pulling wheelies regularly. While it may not last quite as long as the nikasil Malossi or Pinasco kits, it's the most \"bang\" for the buck!\u003cp\u003ePerfect when mated with a Prima pipe! The 26\/26 carbs are very popular with this cylinder too.\u003c\/p\u003e\u003cp\u003eReplacement pistons can be purchased here:\u003cbr\u003eStandard size: single ring, double ring\u003cbr\u003eFirst oversize: double ring\u003cbr\u003eSecond oversize: single ring, double ring\u003c\/p\u003e\u003cp\u003eReplacement rings can be purchased here:\u003cbr\u003eStandard size: Dyke ring\u003cbr\u003eFirst oversize: Dyke ring, Standard ring\u003cbr\u003eSecond oversize: Dyke ring, Standard ring\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e There are too many variables involved with user-installed parts, and pushing the limits of your engine tends to wear parts faster. Use at your own risk!\u003c\/p\u003e\n\n\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964615295297,"sku":"PCK1","price":375.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8503-0-PCK1_641b9209-f8b3-47b8-b1b0-bdef8ac002cb.jpg?v=1792557950"},{"product_id":"malossi-cylinder-kit-72cc-mhr-alloy-12mm-pin-lc-piaggio-2t-engine","title":"Malossi Cylinder Kit (72cc, MHR, Alloy, 12mm Pin, LC); Piaggio 2t Engine","description":"Malossi's MHR Cylinder Kits are arguably the finest performance kits available, period. They feature alloy castings, precision machined, with Nikasil lined bore and Asso pistons. Made in Italy.\n\n\u003cp\u003e\n\nReplacement pistons (M 348654) can be ordered here.\n\n\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e\n\n \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964616573249,"sku":"M 318455","price":499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-8848-0-M_20318455_7f52f04a-c31d-43f6-99f9-59e3ec5dcfac.jpg?v=1792557956"},{"product_id":"malossi-cylinder-kit-65cc-10mm-iron-lc-derbi-morini","title":"Malossi Cylinder Kit (65cc, 10mm, Iron, LC); Derbi, Morini","description":"Scooter 65cc cylinder Kit Derbi (water-cooled until 2003)\n\n\u003cp\u003e- Material: wearproof, laminate special cast iron - Recalculated heat exchange surfaces - CNC machining - Transfer and exhaust ports designed for maximum efficiency - Lightened and reinforced, special aluminium alloy pistons with a high silicon content - Optimized compression ratio \u003c\/p\u003e\n\n\u003cp\u003eReplacement pistons (M 346445) are available here.\u003c\/p\u003e\n\n\u003cp\u003eReplacement rings (M 354501) are available here.\u003c\/p\u003e\n\n\u003cp\u003eFor the following engines:\u003c\/p\u003e\n\n\u003cp\u003e* Derbi Scooter 50 watercooled * DERBI ATLANTIS 50 watercooled 1999-2000 \u003cbr\u003e * Derbi Predator 50 LC watercooled\u003c\/p\u003e\u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":67964624634177,"sku":"M 3111146","price":351.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9717-0-m_203111146_c17952e3-10bc-4077-9d86-52ca31500cac.jpg?v=1792558014"},{"product_id":"tfc-high-power-cam-gy6","title":"TFC S-1 High Power Camshaft - GY6 Big Bore Builds","description":"\u003cp\u003eMaximize the power potential of your GY6 big-bore build with the \u003cstrong\u003eTFC Special S-1 High Angle Camshaft\u003c\/strong\u003e. Designed specifically for engines running 58.5mm to 63mm cylinder bores, the S-1 delivers 6mm of valve lift — significantly more than a stock cam — keeping the valves open longer and pushing them further to pull in more air and fuel on every stroke. The result is stronger mid-range and top-end power that a big bore cylinder alone can't fully unlock without a matching cam upgrade.\u003c\/p\u003e\u003cp\u003eThis is the cam to run when you've already installed a big bore kit and want to extract the full power it's capable of. Pairs well with a high-flow head, performance exhaust, and upjetted carburetor.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e6mm valve lift — significantly more than stock for stronger mid and top-end power\u003c\/li\u003e\n\u003cli\u003eHigh angle S-1 profile optimized for 58.5mm–63mm big bore cylinders\u003c\/li\u003e\n\u003cli\u003e34-tooth cam gear, 6002C3 bearing — direct drop-in for GY6 QMI\/QMJ 152\/157\u003c\/li\u003e\n\u003cli\u003eNot recommended for stock 57mm bore — designed for big bore builds\u003c\/li\u003e\n\u003cli\u003eMade in Taiwan by TFC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCam Profile:\u003c\/strong\u003e TFC Special S-1 high angle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Lift:\u003c\/strong\u003e 6mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Lobe Diameter:\u003c\/strong\u003e 26.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Lobe Diameter:\u003c\/strong\u003e 26.35mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCam Gear Teeth:\u003c\/strong\u003e 34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCam Bearing:\u003c\/strong\u003e 6002C3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Fitment:\u003c\/strong\u003e 58.5mm–63mm cylinder bores\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMade in Taiwan by TFC\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eDesigned for \u003cstrong\u003eGY6 QMI\/QMJ 152\/157\u003c\/strong\u003e (125cc\/150cc) 4-stroke engines running big bore cylinders from 58.5mm to 63mm. Not recommended for stock 57mm bore engines — the aggressive lift profile is optimized for larger displacement builds.\u003c\/p\u003e\u003cblockquote\u003e\n\u003cstrong\u003eBuild Tip:\u003c\/strong\u003e The S-1 cam works best paired with a big bore cylinder (61mm–63mm), a high-flow or big valve head, performance exhaust, and an upjetted carburetor. Running a high-lift cam on a stock head with stock jetting will limit gains and may cause a lean condition at high RPM.\u003c\/blockquote\u003e\u003cp\u003eThis product is intended for off-road use only and is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/p\u003e","brand":"TFC","offers":[{"title":"Default Title","offer_id":67964627255617,"sku":"179-11","price":119.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/179-11_c953ae0e-04ec-40cd-941c-5f99079770da.webp?v=1792993071"},{"product_id":"pinasco-cylinder-kit-piaggio-lc-engines","title":"Pinasco, Cylinder Kit; Piaggio LC engines","description":"Pinasco alloy Nikasil cylinder kit for Piaggio liquid cooled 50cc engines. Extremely high quality. Highly recommended. \u003cp\u003eNot legal for use in California on pollution controlled vehicles.  Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Pinasco","offers":[{"title":"Default Title","offer_id":67964630860097,"sku":"P 10059902","price":269.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9195-0-P_2010059902_3f3df79f-173c-4d96-ac24-c5b57da985e3.jpg?v=1792558021"},{"product_id":"polini-contessa-big-bore-kit-72cc-yamaha-zuma-50-2t","title":"Polini Contessa 72cc Big Bore Kit - Minarelli 2T","description":"\u003cp\u003ePolini's entry-level Contessa 72cc Big Bore Kit is an ideal first performance upgrade for riders looking to extract more power from their 2-stroke horizontal Minarelli engine. Relatively straightforward to install and tune, it delivers a meaningful displacement bump without requiring extensive engine work or exotic jetting. Compatible with Yamaha Zuma, BWS, Vino, Jog, Genuine Buddy, RoughHouse, Rattler, and many other Minarelli horizontal-engine scooters.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e72cc displacement upgrade from stock 50cc\u003c\/li\u003e\n\u003cli\u003eCast-iron cylinder for durability and heat retention\u003c\/li\u003e\n\u003cli\u003eAluminum piston with 2 piston rings included\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin with circlips included\u003c\/li\u003e\n\u003cli\u003e2 exhaust studs (6mm) included\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Polini\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 72cc\u003c\/li\u003e\n\u003cli\u003ePiston Diameter: 47mm\u003c\/li\u003e\n\u003cli\u003ePiston Rings: 2x 47mm\u003c\/li\u003e\n\u003cli\u003eWrist Pin: 10mm (with circlips)\u003c\/li\u003e\n\u003cli\u003eCylinder: Cast iron\u003c\/li\u003e\n\u003cli\u003eExhaust Studs: 2x M6\u003c\/li\u003e\n\u003cli\u003eDimensions: 7.5\" L x 6\" W x 5\" H\u003c\/li\u003e\n\u003cli\u003eWeight: 4.5 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eZuma 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eBWS 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eVino 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003eJog 50 (2T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eRoughHouse 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eRattler 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAprilia\u003c\/td\u003e\n\u003ctd\u003eSR (Pre-2000)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdly\u003c\/td\u003e\n\u003ctd\u003eVarious models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal\u003c\/td\u003e\n\u003ctd\u003eMinarelli horizontal 2T engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eBreak-in Note:\u003c\/strong\u003e Ride 200–300 miles before running at full throttle for extended periods.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road and racing use only. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/p\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964636856641,"sku":"1100-1459","price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9977-0-1100-1459_6d30928e-6226-4922-9181-d02c0d8842dd.jpg?v=1792558028"},{"product_id":"polini-contessa-big-bore-kit-72cc-vertical-zuma-vertical","title":"Polini Contessa 2T Big Bore Kit (72cc, Vertical); Zuma Verti","description":"\u003cp\u003ePolini has become the leader in Italian racing cylinder kits.  Their entry level Contessa options are relitively easy to install, tune, and improve the performance of your scooter.  This 72cc kit for the 2T Yamaha Zuma Vertical Engine is the ideal starter big bore kit for someone looking to get significant gain without excess tuning time. \u003c\/p\u003e\n\n\u003cp\u003eDon't forget to properly break in your big bore kit and add about an ounce of 2 stroke oil to your gas tanks.  50cc oil injectors are not meant to lubricate 72cc bores.  For break in, the supplier recommends 200-300 mile before running your bike full throttle for any extensive length of time.\u003c\/p\u003e\n\n\n\n\u003cp\u003e\u003cstrong\u003e*This kit will only fit Pre-2001 Zuma and BWS 50 models.  Will not fit on horizontal motor*  Please confirm your model before purchase.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis product is intended for off-road use only.\u003c\/p\u003e\n\n\u003cp\u003eNot legal for use in California on pollution controlled vehicles. Check local laws before installing.\u003c\/p\u003e \u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964636987713,"sku":"1100-1458","price":335.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9800-0-1100-1458_0ada4c9c-7ca1-493b-8d40-d1b0b883a853.jpg?v=1792558028"},{"product_id":"polini-corsa-cylinder-kit-horizontal10mm-pin-zuma-50-2t","title":"Polini Corsa 70cc Racing Cylinder Kit: Zuma, RH \u0026 Buddy 50","description":"\u003ch2\u003eMid-Race Performance: Polini Corsa 70cc Iron Cylinder\u003c\/h2\u003e\u003cp\u003eStep up to \"Mid-Race\" power with the \u003cstrong\u003ePolini Corsa Cylinder Kit\u003c\/strong\u003e. While based on the legendary Polini 70cc Sport, the Corsa is factory-tuned with revised port timing and a polished exhaust port to deliver significantly more horsepower and higher RPM ceilings. This cast-iron kit combines the bulletproof reliability of a daily driver with the aggressive acceleration required for the track.\u003c\/p\u003e\u003ch3\u003eTechnical Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Ported:\u003c\/strong\u003e Features hand-finished porting from Polini technicians to optimize scavenging and increase top-end power compared to the standard 70cc Sport kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal-Resistant Cast Iron:\u003c\/strong\u003e Provides a rugged, long-lasting bore that can be honed and oversized if needed, offering better durability for high-heat racing conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChrome-Plated Piston Rings:\u003c\/strong\u003e Includes specialized high-tension rings designed to reduce friction and maintain a perfect seal at high crankshaft speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10mm Wrist Pin:\u003c\/strong\u003e Engineered specifically for the standard 10mm small-end bearings found on horizontal Minarelli and Genuine 50cc engines.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis kit is designed for \u003cstrong\u003eHorizontal Minarelli-based 2-Stroke\u003c\/strong\u003e engines. It is a direct-fit performance upgrade for:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eCompatible 50cc 2-Stroke Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGenuine Scooter Co.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuddy 50, RoughHouse 50, Rattler 50, Black Jack 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZuma 50 (2002-2011), Vino 50, Jog (Horizontal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAprilia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSR50 (Pre-2000 Minarelli Engine)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMalaguti\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eF12 Phantom, F15 Firefox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eNote: Not compatible with AF05E engines (pre-1994 model years).\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 70cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Diameter:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin Size:\u003c\/strong\u003e 10mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Iron Cylinder \/ Aluminum Piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Air Cooled\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eMechanic's Note:\u003c\/strong\u003e The Corsa is a high-revving kit. To prevent engine failure, you \u003cstrong\u003emust\u003c\/strong\u003e increase your oil-to-fuel ratio by adding 1oz of high-quality 2-stroke oil per gallon of gas. Additionally, this kit performs best when paired with at least a \u003cstrong\u003e17.5mm or 19.1mm Carburetor\u003c\/strong\u003e and a mid-race expansion chamber exhaust.\u003c\/blockquote\u003e\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 1100-1486 \u003cbr\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Polini Motori (Italy)\u003c\/p\u003e\u003cp\u003ePolini Corsa big bore (70cc) racing cylinder kit for Genuine Buddy 50, RoughHouse 50, and Rattler 50 scooters, Zuma 50 2T, and other horizontal Minarelli-based engines. Not compatible with \u003cspan\u003eAF05E engines \u003c\/span\u003e\u003cspan\u003e(pre-1994 model years).\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e\u003cspan\u003e It's important to properly break in your big-bore kit for 200-300 miles before running your bike full throttle for any extended length of time. The supplier recommends adding one ounce of 2-stroke oil to your gas tank; 50cc oil injectors\u003c\/span\u003e\u003c\/p\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964637217089,"sku":"1100-1486","price":400.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-10045-0-1100-1486_4c6ab654-1ff5-45f0-bedd-9035d65c6cdd.jpg?v=1792558028"},{"product_id":"scooterworks-big-bore-kit-63mm-180cc-gy6-150","title":"RDLN 63mm 180cc Big Bore Kit - GY6 125cc \u0026 150cc","description":"\u003ch2\u003eDescription\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003eRDLN 63mm 180cc Big Bore Kit\u003c\/strong\u003e takes a GY6 125cc or 150cc engine (based on the Honda GY6 design) up to 180cc for more low-end torque and stronger hill-climbing power. It's a complete top end in one box, a popular upgrade for scooters, go-karts, buggies and small utility vehicles running a GY6.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCase boring required:\u003c\/strong\u003e The cylinder sleeve measures 64.9mm on the outside, so your engine case will likely need to be bored out to fit it. Forcing the cylinder in without boring will damage it. Use the Engine Case Boring Tool (202-37) for the job.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e180cc displacement:\u003c\/strong\u003e 63mm bore with the stock 57.8mm GY6 stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete top-end kit:\u003c\/strong\u003e Cylinder, piston, wrist pin, circlips, ring set and gaskets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinned aluminum cylinder:\u003c\/strong\u003e Deep cooling fins to help shed heat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits 54mm stud spacing:\u003c\/strong\u003e Made for standard GY6 125\/150cc engine cases.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 1100-1438\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 812722026165\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 63mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 180cc (with stock 57.8mm stroke)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSleeve outer diameter:\u003c\/strong\u003e 64.9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder height:\u003c\/strong\u003e 90.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStud spacing:\u003c\/strong\u003e 54mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Cylinder, piston, wrist pin, 2 circlips, 5-piece ring set, base gasket, head gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement rings:\u003c\/strong\u003e \u003ca href=\"\/products\/piston-rings-63mm-cylinder-kit-gy6?variant=67964649931073\"\u003eRDLN 63mm Piston Ring Set (1100-1463)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso listed as:\u003c\/strong\u003e OPS 164-310\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e RDLN\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eExamples\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGY6 engine codes\u003c\/td\u003e\n\u003ctd\u003e152QMI, 157QMJ, 161QMK, 1P57QMJ, 1P61QMK, YN1P57QMJ, JJ157QMJ, BN157QMJ, BN161QMK-A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScooters\u003c\/td\u003e\n\u003ctd\u003eZNEN, Wolf, Ice Bear, Bintelli, Lance, Jonway, Roketa and other GY6 125\/150cc models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGo-karts and buggies\u003c\/td\u003e\n\u003ctd\u003eHammerhead 150 series, Carter Talon 150, TrailMaster 150 XRX\/XRS, American SportWorks, Manco 150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eATVs and UTVs\u003c\/td\u003e\n\u003ctd\u003eTaoTao Bull 150, Rhino 150 and other GY6 150cc utility models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eCase boring is required on all applications. Check the engine code stamped on your engine case to confirm fit.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBore the engine case to fit the 64.9mm sleeve before installing.\u003c\/li\u003e\n\u003cli\u003eA bigger engine needs more fuel. Re-jet your stock carburetor or upgrade to a larger performance carb.\u003c\/li\u003e\n\u003cli\u003eA performance camshaft pairs well with this kit to make the most of the extra displacement.\u003c\/li\u003e\n\u003cli\u003eBreak the engine in gently for the first few hundred miles.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eProduct Diagrams\u003c\/h2\u003e\u003cul class=\"az-content-resources\"\u003e\u003cli\u003e\n\u003ca href=\"\/search?view=az-assembly\u0026amp;q=244\"\u003eGY6 CYLINDER\u003c\/a\u003e \u003cspan\u003eCallout 1\u003c\/span\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"RDLN","offers":[{"title":"Default Title","offer_id":67964639772993,"sku":"1100-1438","price":127.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9263-0-1100-1438_6e3c871f-9e80-4cec-96eb-885b578e8a7f.jpg?v=1792558031"},{"product_id":"engine-cases-pair-long-big-bore-custom-gy6","title":"Engine Cases (Pair, Long, Big Bore, Custom); GY6","description":"\u003cp\u003e We machine these in matched pairs ourselves, and we bore them up to 63mm, big enough to fit a 63mm performance cylinder kit. Go big! Pick up a new crankcase gasket while you're at it. \u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMatched right and left sides\u003c\/li\u003e\n\u003cli\u003eStamped serial numbers ensure you have a matched set\u003c\/li\u003e\n\u003cli\u003eDimensions: 10\"L x 10\"W x 4\"H\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e157QMJ-based 125cc \/ 150cc \/ 169cc engines with the following engine codes:\u003c\/strong\u003e\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e157QMJ\u003c\/td\u003e\n\u003ctd\u003e161QMK\u003c\/td\u003e\n\u003ctd\u003e152QMI\u003c\/td\u003e\n\u003ctd\u003e1P61QMK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYN1P57QMJ\u003c\/td\u003e\n\u003ctd\u003e1P52FMI\u003c\/td\u003e\n\u003ctd\u003e154FMI\u003c\/td\u003e\n\u003ctd\u003eJJ157QMJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1P57QMJ\u003c\/td\u003e\n\u003ctd\u003eBN157QMJ\u003c\/td\u003e\n\u003ctd\u003eBN161QMK-A\u003c\/td\u003e\n\u003ctd\u003eOther QMJ, QMK, and QMI models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eDon't see your engine listed? If the engine code includes \"QM\" or \"FM\", this product is compatible with your vehicle.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eAbout AZScooterParts:\u003c\/b\u003e Since the beginning in 1989, AZScooterParts has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to aftermarket parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.\u003c\/p\u003e\u003ch4\u003eThis product is intended for off-road use only.\u003c\/h4\u003e\u003ch4\u003eThis product is not intended for use on public roads or land.\u003c\/h4\u003e\u003ch4\u003eThis product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/h4\u003e","brand":"Brand not specified","offers":[{"title":"Default Title","offer_id":67964642951489,"sku":"1100-1418","price":172.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9095-0-1100-1418_07bd1d9d-c1bf-448a-9f7a-e7fcc6bd722e.jpg?v=1792558034"},{"product_id":"universal-parts-gy6-150cc-57-4mm-cylinder-kit-for-buggies-and-atvs","title":"Universal Parts GY6 150cc 57.4mm Cylinder Kit for Buggy\/ATV","description":"Universal Parts 57.4mm Cylinder Kit for 150cc GY6 4-stroke engine powered buggies and ATVs with larger cylinder stud spacing than standard GY6 engines (please see specs). Includes cylinder, piston, pin, circlips, rings, head gasket and base gasket.  \u003cul\u003e \n\n\u003cli\u003eBore: 57.4mm \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Stud Spacing (Diagonal): 79mm \n\n\u003c\/li\u003e\n\u003cli\u003eOverall Height: 89.3mm   \n\n\u003c\/li\u003e\n\u003cli\u003eCylinder Sleeve Outer Diameter: 62.5mm\u003c\/li\u003e\n\u003cli\u003ePiston Pin Diameter: 15mm\u003c\/li\u003e\n\u003cli\u003ePiston Pin Length: 42mm\u003c\/li\u003e\n\u003c\/ul\u003eGY6 QMI\/QMJ 152\/157, Various unlisted makes\/models\u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":67964645376321,"sku":"164-336","price":77.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-11562-0-164-336.main.01.default.jpg?v=1792558036"},{"product_id":"polini-big-bore-kit-vespa-primavera-lx-50-fly-50-p50","title":"Polini 78.8cc Big Bore Kit | Vespa Piaggio 4T 50cc Engines","description":"\u003cp\u003eBump your Piaggio 4T 50cc scooter to \u003cstrong\u003e78.8cc\u003c\/strong\u003e with the \u003cstrong\u003ePolini Big Bore Kit\u003c\/strong\u003e. Designed for 4-stroke 2-valve and 4-valve 49cc Piaggio engines, this complete kit includes a finned aluminum alloy cylinder, flat-top piston, full gasket set, and all hardware needed for the bore-up. The 11.6:1 compression ratio delivers a significant increase in mid-range and top-end power, and the included gear-up ratio (14:43) provides a 60% increase over stock (11:54) for improved top speed.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFor off-road and closed-course competition use only. Not intended for use on public roads or land. Not legal for use in California on pollution-controlled vehicles. Performance upgrades are not covered under warranty.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eKit Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFinned aluminum alloy cylinder (78.8cc bore)\u003c\/li\u003e\n\u003cli\u003eFlat-top piston\u003c\/li\u003e\n\u003cli\u003ePiston rings (3-ring set)\u003c\/li\u003e\n\u003cli\u003eCirclips (x2)\u003c\/li\u003e\n\u003cli\u003eWrist pin and dowel pins\u003c\/li\u003e\n\u003cli\u003eHead gasket (green composite)\u003c\/li\u003e\n\u003cli\u003eBase gasket (black)\u003c\/li\u003e\n\u003cli\u003eExhaust gasket\u003c\/li\u003e\n\u003cli\u003eRubber intake manifold spacers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIncreases displacement from 49cc to 78.8cc on Piaggio 4T 2-valve and 4-valve engines\u003c\/li\u003e\n\u003cli\u003e11.6:1 compression ratio for significant mid-range and top-end power gains\u003c\/li\u003e\n\u003cli\u003e14:43 gear-up ratio — 60% increase over stock 11:54 for improved top speed\u003c\/li\u003e\n\u003cli\u003eComplete kit: aluminum cylinder, piston, rings, circlips, wrist pin, full gasket set, and intake spacers\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Polini — Polini P\/N 140.0223\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 78.8cc\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 11.6:1\u003c\/li\u003e\n\u003cli\u003eGear-Up Ratio: 14:43 (60% increase over stock 11:54)\u003c\/li\u003e\n\u003cli\u003eCylinder Material: Aluminum alloy\u003c\/li\u003e\n\u003cli\u003ePolini Part Number: 140.0223\u003c\/li\u003e\n\u003cli\u003eMade in Italy\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVespa LX 50 (2006–2009) — 4-stroke 2-valve\u003c\/li\u003e\n\u003cli\u003eVespa LX 50 (2010–2014) — 4-stroke 4-valve\u003c\/li\u003e\n\u003cli\u003eVespa S 50 (2009–2014) — 4-stroke 4-valve\u003c\/li\u003e\n\u003cli\u003eVespa Primavera 50 4V Carb (2015–2019)\u003c\/li\u003e\n\u003cli\u003eVespa Sprint 50 4V Carb (2015–2019)\u003c\/li\u003e\n\u003cli\u003ePiaggio Fly 50 (4T)\u003c\/li\u003e\n\u003cli\u003eScootcoupe P50\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/p\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964645507393,"sku":"1100-1467","price":308.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9380-0-1100-1467_6b28e493-f667-4445-8af5-20d499914367.jpg?v=1792558037"},{"product_id":"polini-contessa-cylinder-kit-72cc-honda-dio-kymco-zx","title":"Polini Contessa Cylinder Kit (72cc); Honda Dio, Kymco ZX","description":"\u003cp\u003ePolini's big bore 72cc Contessa cylinder kit for the Honda Dio, Elite, and Kymco ZX is the ideal starter big bore kit for riders looking to get significant gain without excess tuning time.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePolini aluminum piston: 47mm\u003c\/li\u003e\n\u003cli\u003ePolini piston rings: 47mm\u003c\/li\u003e\n\u003cli\u003ePolini wrist pin with circlips\u003c\/li\u003e\n\u003cli\u003ePolini cast-iron cylinder \u003c\/li\u003e\n\u003cli\u003eLength stud to stud: 48mm\u003c\/li\u003e\n\u003cli\u003eLength stud to stud (diagonal): 68mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHonda Dio\u003c\/td\u003e\n\u003ctd\u003eHonda Elite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKymco ZX\u003c\/td\u003e\n\u003ctd\u003e \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e It's important to properly break in your big bore kit for 200-300 miles before running your bike full throttle for any extended length of time. The supplier recommends adding one ounce of 2-stroke oil to your gas tank; 50cc oil injectors are not meant to lubricate 72cc bores. \u003c\/p\u003e\u003cp\u003e\u003cb\u003eAbout Polini:\u003cspan\u003e  \u003c\/span\u003e\u003c\/b\u003eFor over 50 years,\u003cb\u003e \u003c\/b\u003ePolini has stood unparalleled in the racing and tuning scene.\u003cspan\u003e  \u003c\/span\u003ePolini has powered both off-road and road racing legends to multiple MXGP and MotoGP world championships including the legendary Valentino Rossi.\u003cspan\u003e  \u003c\/span\u003ePolini sets the standard for high-end tuning and top-quality performance components.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eMade in Italy.\u003c\/p\u003e\u003ch4\u003eThis product is intended for off-road use only.\u003c\/h4\u003e\u003ch4\u003eThis product is not intended for use on public roads or land.\u003c\/h4\u003e\u003ch4\u003eThis product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.\u003c\/h4\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964646621505,"sku":"1100-1457","price":350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9757-0-1100-1457_96368567-8c6a-4144-b589-62d8abd9b583.jpg?v=1792558038"},{"product_id":"polini-corsa-big-bore-kit-yamaha-zuma-50-vertical-engine","title":"Polini Corsa Big Bore Kit; 2T Yamaha Zuma 50 Vertical Engine","description":"\u003cp\u003ePolini Corsa 2T Big Bore Kit for the Pre-2002 Yamaha Zuma 50cc 2-stroke. This is the vertical cylinder engine.\u003c\/p\u003e\n\n\u003cp\u003eNot legal for use in California on pollution controlled vehicles. Check local laws before installing.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e\u003ch3\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Polini","offers":[{"title":"Default Title","offer_id":67964647440705,"sku":"1100-1462","price":344.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-9334-0-1100-1462_7db613f1-ef3d-47ba-97f0-610d013be3f0.jpg?v=1792558040"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/collections\/az-p051-cylinder-kits.png?v=1793858257","url":"https:\/\/azscooterparts.com\/collections\/scooter-big-bore-kits.oembed","provider":"AZScooterParts","version":"1.0","type":"link"}