{"title":"2-Stroke 70cc Cylinder Kits","description":"","products":[{"product_id":"malossi-cylinder-kit-et2-m-316926","title":"Malossi 70cc Big Bore Cylinder Kit - Vespa Piaggio ET2 50","description":"\u003ch2\u003eMalossi 70cc Big Bore Cylinder Kit – Vespa ET2 \u0026amp; Piaggio 50\u003c\/h2\u003e\u003cp\u003eUnlock significant power gains with the \u003cstrong\u003eMalossi 70cc Cast Iron Cylinder Kit\u003c\/strong\u003e. Engineered in Italy, this kit provides the perfect balance between high-performance output and long-term daily reliability. It is the go-to upgrade for riders looking to increase torque and top-end speed without sacrificing the durability of their engine.\u003c\/p\u003e\u003cp\u003eMalossi engineers have optimized the thermodynamics and internal fluid mechanics with fanatical precision. By refining the transfer ports, exhaust timing, and combustion chamber shape, this kit achieves a high level of turbulence, leading to better fuel efficiency and a drastic reduction in exhaust emissions.\u003c\/p\u003e\u003ch3\u003eKey Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear-Proof Material:\u003c\/strong\u003e Specialized laminate cast iron construction designed for maximum component life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Cooling:\u003c\/strong\u003e Recalculated heat exchange surfaces for superior temperature management.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Silicon Piston:\u003c\/strong\u003e Includes a lightened and reinforced special aluminum alloy piston for reduced friction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Compression:\u003c\/strong\u003e High-turbulence combustion chamber designed for maximum efficiency.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Model Fitment\u003c\/h3\u003e\u003cp\u003eThis kit is a direct fit for \u003cstrong\u003e50cc 2-Stroke (Air Cooled)\u003c\/strong\u003e Piaggio engines, including:\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eVespa Models:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVespa ET2:\u003c\/strong\u003e All Years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVespa LX 50:\u003c\/strong\u003e 2-Stroke Versions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVespa S 50:\u003c\/strong\u003e 2-Stroke Versions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003ePiaggio \u0026amp; Aprilia Models:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiaggio Typhoon 50:\u003c\/strong\u003e (2007-2010)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiaggio LT 50:\u003c\/strong\u003e All Years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiaggio Fly 50:\u003c\/strong\u003e 2-Stroke Versions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAprilia SR50 Motard:\u003c\/strong\u003e (Piaggio Engine Models)\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\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\u003eMaterial:\u003c\/strong\u003e Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Pin:\u003c\/strong\u003e 12mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachining:\u003c\/strong\u003e NC Machine-Tool finished for precision tolerances\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eMaintenance \u0026amp; Support\u003c\/h3\u003e\u003cp\u003eTo keep your Malossi kit running at peak performance, we carry the following replacement parts:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ca href=\"http:\/\/www.scooterworks.com\/Malossi-Piston-470mm12mm-wrist-pin-PiaggioHondaKymco-P7030.aspx\"\u003eReplacement Piston Kit\u003c\/a\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ca href=\"http:\/\/www.scooterworks.com\/Malossi-Piston-Rings-set-P7038.aspx\"\u003eReplacement Piston Rings\u003c\/a\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"color: #d9534f;\"\u003e\u003cstrong\u003e?? Safety \u0026amp; Legal Note:\u003c\/strong\u003e Not legal for use in California on pollution-controlled vehicles. This product is intended for off-road\/racing use only. Check local laws before installing.\u003c\/p\u003e\u003cp\u003eMalossi cast-iron cylinder kits: the best balance between component performanceand life of the component. This kit will fit Vespa ET2 and other scooters with a 50cc ET2 Piaggio engine.\u003c\/p\u003e\u003cp\u003eThe cast-iron cylinder kits produced by Malossi s.p.A. are designed and manufactured with the specific objective of obtaining high combustion efficiency, long life, and a reliability that suits the Malossi name.\u003c\/p\u003e\u003cp\u003eOwing to the experience gained in the preparation of cylinder kits for race, Malossi engineers have developed the thermodynamics of cast-iron cylinder kits to the fullest and designed the inner fuid mechanics of the cylinder kit with fanatical precision (see the tranfer pipes, exhaust and combustion chamber), thereby obtaining a high level of turbolence in the combustion chamber. The latter has permitted a substantial reduction in specific consumption and a drastic reduction in the exhaust emission of pollutants.\u003c\/p\u003e\u003cp\u003eTechnical features:\u003c\/p\u003e\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\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":46758062194968,"sku":"M 316926","price":260.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/1_malossi.jpg?v=1779378425"},{"product_id":"malossi-cylinder-kit70ccironacminarellibuddy-50-zuma50-m-317083","title":"Malossi 70cc Big Bore Cylinder Kit: Genuine \/ Minarelli 2T","description":"\u003cp\u003eTransform your sluggish 50cc into a high-torque street machine with the legendary \u003cstrong\u003eMalossi 70cc Cast Iron Sport Cylinder Kit\u003c\/strong\u003e. Precision-engineered and cast in Italy, this air-cooled (AC) big-bore kit is the industry benchmark for riders demanding a massive bump in acceleration, hill-climbing torque, and mid-range power without sacrificing daily reliability. By optimizing internal port timing and expanding the bore diameter, Malossi delivers a broad, forgiving powerband that pairs beautifully with stock or sport-class setups.\u003c\/p\u003e\u003ch3\u003ePremium Italian Engineering Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear-Resistant Cast Iron Bore:\u003c\/strong\u003e Engineered from high-tensile, thermal-stable cast iron alloys capable of withstanding extreme daily operation and structural stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Port Architecture:\u003c\/strong\u003e Features recalculated transfer and exhaust port geometries designed to maximize scavenging efficiency and low-to-mid range torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Compression Cylinder Head:\u003c\/strong\u003e Includes a dedicated, die-cast aluminum cylinder head designed to optimize squish clearance and maximize combustion efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Dual-Ring Piston:\u003c\/strong\u003e Ships with a premium light-alloy piston assembly utilizing two high-strength compression rings for reliable sealing and extended top-end life.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment \u0026amp; Wrist Pin Guide\u003c\/h3\u003e\u003cp\u003eThis cylinder kit is engineered strictly for \u003cstrong\u003ehorizontal, air-cooled (AC) 2-stroke Minarelli and Minarelli-clone engine blocks\u003c\/strong\u003e equipped with a \u003cstrong\u003e10mm wrist pin\u003c\/strong\u003e:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eMake \/ Manufacturer\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eModel Family Compatibility\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eEngine Architecture \u0026amp; Fitment Notes\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\u003c\/td\u003e\n\u003ctd\u003eDirect Fit (Standard 10mm Wrist Pin Canks)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGenuine Scooter Co.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRattler 50 \/ Black Cat 50\u003c\/td\u003e\n\u003ctd\u003eDirect Fit (Standard 10mm Wrist Pin Cranks)\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 \"Bugeye\")\u003c\/td\u003e\n\u003ctd\u003eDirect Fit (Horizontal 2-Stroke Minarelli Block)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVino 50 2T \/ Jog 50 (Horizontal)\u003c\/td\u003e\n\u003ctd\u003eDirect Fit (Verify horizontal air-cooled configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAprilia \/ Malaguti\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScarabeo 50 2T \/ F-10 \/ Yesterday\u003c\/td\u003e\n\u003ctd\u003eFits Minarelli Horizontal AC engine architectures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp style=\"color: #b30000; font-weight: bold;\"\u003e \u003c\/p\u003e\u003cp style=\"color: #b30000; font-weight: bold;\"\u003eCRITICAL WRIST PIN FITMENT WARNING: This kit includes a 10mm wrist pin piston. While standard Genuine 50cc and Yamaha Zuma Bugeye models use a 10mm pin from the factory, some vintage European models, custom aftermarket cranks, or older Yamaha \"Prebug\" (1989–2001) vertical models utilize a 12mm wrist pin. Always measure your crankshaft small-end needle bearing layout before ordering.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement Capacity:\u003c\/strong\u003e 70cc (Sport Class Baseline)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Bore Diameter:\u003c\/strong\u003e 47mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin Diameter:\u003c\/strong\u003e 10mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling Configuration:\u003c\/strong\u003e Air-Cooled (AC) Only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Composition:\u003c\/strong\u003e Heavy-Duty Cast Iron Cylinder \/ Aluminum Head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 4614340 (46 14340)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Italy (IT)\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eCarburetor Tuning Note:\u003c\/strong\u003e Running a 70cc kit requires immediate fuel calibration. You MUST up-jet your factory carburetor main jet (typically an increase of 10–15% in size) or pair this kit with an upgraded carburetor layout to prevent running dangerously lean and causing immediate structural heat seizure.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cstrong\u003ePro Maintenance Tip:\u003c\/strong\u003e Always practice a proper heat-cycle break-in procedure during the first 150–200 miles. Mix a light 50:1 ratio of high-quality synthetic 2-stroke oil directly into your first full tank of gas to guarantee extra top-end lubrication while the new rings seat to the cast iron walls.\u003c\/blockquote\u003e\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e Please check your wrist pin size before ordering. This kit comes with a 10mm wrist pin piston. If your scooter has a 12mm wrist pin, you'll need to also order \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-470mm12mm-wrist-pin-piaggiohondakymco\" title=\"malossi 12mm wrist pin piston\"\u003ethis piston\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eReplacement 10mm pistons are available \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-10mm-wrist-pin\" title=\"malossi 10mm wrist pin\"\u003ehere.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eReplacement rings are available \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-rings-set\" title=\"malossi piston rings set\"\u003ehere.\u003c\/a\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cstrong\u003eNotice:\u003c\/strong\u003e This product is intended for off-road and racing use only. Not legal for use on pollution-controlled vehicles in California or on public roads. Check local laws before installing. Performance upgrades are not covered under warranty.\u003cbr\u003e\n\u003c\/blockquote\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e M4614340 \u003cbr\u003e\u003cstrong\u003eVendor:\u003c\/strong\u003e Malossi \u003cbr\u003e\u003cstrong\u003eCategory:\u003c\/strong\u003e Engine Parts \/ Cylinder Kits\u003c\/p\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eCalifornia Prop 65 Warning:\u003c\/strong\u003e \u003cstrong\u003e\u003ca href=\"https:\/\/www.P65Warnings.ca.gov\" target=\"_blank\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":46758063145240,"sku":"M 317083","price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/products\/M_20317083_e7352dbb-32b4-42b9-b549-abfc3c24f278.jpg?v=1695290335"},{"product_id":"polini-corsa-cylinder-kit-horizontal10mm-pin-zuma-50-2t-1100-1486","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 style=\"width: 100%; height: 106.969px;\"\u003e\n\u003cthead\u003e\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"text-align: left; width: 28.8477%; height: 19.5938px;\"\u003eBrand\u003c\/th\u003e\n\u003cth style=\"text-align: left; width: 68.2952%; height: 19.5938px;\"\u003eCompatible 50cc 2-Stroke Models\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 28.8477%; height: 19.5938px;\"\u003e\u003cstrong\u003eGenuine Scooter Co.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 68.2952%; height: 19.5938px;\"\u003eBuddy 50, RoughHouse 50, Rattler 50, Black Jack 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 28.8477%; height: 19.5938px;\"\u003e\u003cstrong\u003eYamaha\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 68.2952%; height: 19.5938px;\"\u003eZuma 50 (2002-2011), Vino 50, Jog (Horizontal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 28.8477%; height: 19.5938px;\"\u003e\u003cstrong\u003eAprilia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 68.2952%; height: 19.5938px;\"\u003eSR50 (Pre-2000 Minarelli Engine)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 28.5938px;\"\u003e\n\u003ctd style=\"width: 28.8477%; height: 28.5938px;\"\u003e\u003cstrong\u003eMalaguti\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 68.2952%; height: 28.5938px;\"\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\u003ch3\u003eTechnical Specifications\u003c\/h3\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 style=\"font-size: 0.85em; color: #666;\"\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. We also recommend 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":46760721088792,"sku":"1100-1486","price":400.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/products\/1100-1486_4c6ab654-1ff5-45f0-bedd-9035d65c6cdd.jpg?v=1695314462"},{"product_id":"malossi-mhr-cyl-kit-buddy-50yamaha-vino-etc-m-318437","title":"Malossi, MHR Cyl Kit; Buddy 50\/Yamaha Vino etc.","description":"\u003cp\u003eMalossi MHR Cylinder Kit for Genuine Buddy 50, RoughHouse 50, RoughHouse 50 Sport, Yamaha Jog, Zuma 50 and Vino 50 2T scooters. This is a replica of the cylinder that Malossi uses on its own racing team. Bumps you up to 70cc!\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNOTE: \u003c\/strong\u003eReplacement \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-10mm-wrist-pin\" title=\"malossi piston 10mm wrist pin\"\u003epistons with 10mm wrist pin\u003c\/a\u003e and \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-rings-set\" title=\"malossi 47mm piston ring set \"\u003ereplacement piston rings\u003c\/a\u003e are available online. \u003ca href=\"https:\/\/www.scooterworks.com\/products\/malossi-piston-rings-set\" title=\"malossi 47mm piston rings set\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAluminum cylinder with Nikasil lined bore\u003c\/li\u003e\n\u003cli\u003eAsso aluminum piston: 47mm\u003c\/li\u003e\n\u003cli\u003eWrist pin: 10mm\u003c\/li\u003e\n\u003cli\u003eIncludes 2 piston rings and HTSR cylinder head \u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility: \u003c\/strong\u003e\u003c\/p\u003e\u003ctable width=\"100%\" style=\"width: 100%;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 51.3081%;\"\u003eGenuine Buddy 50\u003c\/td\u003e\n\u003ctd style=\"width: 48.4773%;\"\u003eGenuine RoughHouse 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 51.3081%;\"\u003eGenuine RoughHouse 50 Sport\u003c\/td\u003e\n\u003ctd style=\"width: 48.4773%;\"\u003eYamaha Jog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 51.3081%;\"\u003eYamaha Zuma 50\u003c\/td\u003e\n\u003ctd style=\"width: 48.4773%;\"\u003eYamaha Vino 50 2T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eAbout Scooterworks: \u003c\/strong\u003eSince our beginning in 1989, Scooterworks 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 after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.\u003c\/p\u003e","brand":"Scooterworks USA, LLC","offers":[{"title":"Default Title","offer_id":46763497980184,"sku":"M 318437","price":343.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/products\/M318437_a3e65fbd-4a79-4682-beef-97b76ef645d0.jpg?v=1695355282"},{"product_id":"athena-47-6mm-vertical-minarelli-cylinder-kit-135-3","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 class=\"MsoNormal\" style=\"FONT-SIZE: 12pt; FONT-FAMILY: Tahoma; COLOR: rgb(0,0,0); MARGIN: 0in 0in 0pt\"\u003e\u003cspan style=\"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; COLOR: black\"\u003e\u003cfont color=\"#000000\" size=\"2\"\u003e\u003cfont color=\"#0000ff\" size=\"3\"\u003e\u003cfont color=\"#ff0000\"\u003e*You may need to modify your engine case to accommodate the larger cylinder.\u003c\/font\u003e\u003c\/font\u003e\u003c\/font\u003e\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 style=\"color:#983D3C;\"\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":49985962836248,"sku":"135-3","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/135-3.webp?v=1747232945"}],"url":"https:\/\/www.scooterworks.com\/collections\/2-stroke-70cc-cylinder-kits.oembed","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}