{"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","url":"https:\/\/azscooterparts.com\/products\/naraku-gy6-63mm-big-bore-kit","provider":"AZScooterParts","version":"1.0","type":"link"}