{"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","url":"https:\/\/www.scooterworks.com\/products\/malossi-cylinder-kit70ccironacminarellibuddy-50-zuma50-m-317083","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}