{"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","url":"https:\/\/azscooterparts.com\/products\/47mm-qmb139-cylinder-kit","provider":"AZScooterParts","version":"1.0","type":"link"}