{"product_id":"naraku-70cc-performance-cylinder-for-ac-minarelli","title":"Naraku 70cc Big Bore Cylinder Kit - Horizontal Minarelli 2T","description":"\u003cp\u003eThis \u003cstrong\u003eNaraku 70cc Big Bore Cylinder Kit\u003c\/strong\u003e (SKU 137-26) takes an air-cooled horizontal Minarelli 2-stroke, the engine used in the Yamaha Jog and Zuma and in many other 50cc scooters, up to 70cc with the stock crankshaft. It is a complete bore-up kit with a 47mm cylinder, a low-friction molybdenum-coated flat-top piston, rings, a 10mm wrist pin, circlips, and head, base, and exhaust gaskets.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70cc displacement:\u003c\/strong\u003e 47mm bore raises a 50cc engine to 70cc with the stock crank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoly-coated piston:\u003c\/strong\u003e Low-friction flat-top piston reduces wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete kit:\u003c\/strong\u003e Includes cylinder, piston, rings, wrist pin, circlips, and a full gasket set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust flexibility:\u003c\/strong\u003e Works with a stock or performance exhaust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead options:\u003c\/strong\u003e Runs with the stock head for higher compression or with a larger 70cc head.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKit Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCylinder, 47mm bore\u003c\/li\u003e\n\u003cli\u003eMolybdenum-coated flat-top piston with Naraku logo\u003c\/li\u003e\n\u003cli\u003ePiston rings\u003c\/li\u003e\n\u003cli\u003e10mm wrist pin (wrist pin bearing not included)\u003c\/li\u003e\n\u003cli\u003eCirclips (x2)\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\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 137-26\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 70cc with stock crankshaft\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 50.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin diameter:\u003c\/strong\u003e 10mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin bearing:\u003c\/strong\u003e Not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Air-cooled only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine type:\u003c\/strong\u003e Air-cooled horizontal Minarelli 2-stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Naraku (aftermarket)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eThis kit fits air-cooled horizontal Minarelli 2-stroke engines that use a 10mm wrist pin.\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003cth\u003eDoes Not Fit\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha Zuma\u003c\/td\u003e\n\u003ctd\u003eZuma 50 (2002-2011), horizontal AC Minarelli, engine code 5YW \/ CW50\u003c\/td\u003e\n\u003ctd\u003eZuma 1989-2001 (vertical Minarelli) or Zuma 50F \/ 50FX 2012+ (4-stroke)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha Jog and Vino\u003c\/td\u003e\n\u003ctd\u003eJog 50 (1992-2001), Vino 50 2-stroke\u003c\/td\u003e\n\u003ctd\u003eAerox and other liquid-cooled models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGenuine\u003c\/td\u003e\n\u003ctd\u003eBuddy 50, RoughHouse 50 (horizontal Minarelli-type engine, 10mm wrist pin)\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAprilia\u003c\/td\u003e\n\u003ctd\u003eScarabeo 50 (1993-2006), SR50 air-cooled (1994-2002)\u003c\/td\u003e\n\u003ctd\u003eSR50 LC (liquid-cooled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPI\u003c\/td\u003e\n\u003ctd\u003eOliver 50, Hussar 50, Popcorn 50\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eE-Ton\u003c\/td\u003e\n\u003ctd\u003eBeamer 2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMalaguti\u003c\/td\u003e\n\u003ctd\u003eCiak 50 (2002-2005), F10, F12 AC, F15 AC, Yesterday 50 (2001-2006)\u003c\/td\u003e\n\u003ctd\u003eLiquid-cooled versions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBenelli\u003c\/td\u003e\n\u003ctd\u003ePepe 50, Andretti 50\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdly\u003c\/td\u003e\n\u003ctd\u003eThunder Bike 50\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMuZ \/ MZ-Moskito\u003c\/td\u003e\n\u003ctd\u003eRX50, SX50\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChinese 2-stroke clones\u003c\/td\u003e\n\u003ctd\u003e1E40QMB \/ 1PE40QMB engines with a 10mm wrist pin\u003c\/td\u003e\n\u003ctd\u003eClone engines with a 12mm wrist pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eCheck the engine on your scooter before ordering. Confirm it is air-cooled and horizontally mounted, and measure the wrist pin. Some 1E40QMB \/ 1PE40QMB Chinese clone engines use a 12mm wrist pin instead of 10mm, and this kit will not fit those.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder sleeve clearance:\u003c\/strong\u003e The sleeve outer diameter is 50.5mm. Some engine cases need light filing or machining at the case mouth so the skirt slides in smoothly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarburetor and jetting:\u003c\/strong\u003e Going from 50cc to 70cc requires upjetting the main jet, typically 10% to 15% larger, to avoid running lean and seizing the piston.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Naraku","offers":[{"title":"Default Title","offer_id":67964636070209,"sku":"137-26","price":115.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/137-26_b305e140-4c44-4110-bb63-e80d327b7e30.webp?v=1792993055","url":"https:\/\/azscooterparts.com\/products\/naraku-70cc-performance-cylinder-for-ac-minarelli","provider":"AZScooterParts","version":"1.0","type":"link"}