{"product_id":"ncy-cylinder-kit-cast-52mm-88cc-qmb139-1100-1248","title":"NCY 88cc Big Bore Kit (52mm) - 139QMB \/ GY6 50","description":"\u003ch2\u003eNCY 52mm 88cc Big Bore Kit - Extreme Power for QMB139 Engines\u003c\/h2\u003e\u003cp\u003eTurn your 49cc\/50cc scooter into a high-performance machine with the \u003cstrong\u003eNCY 88cc Big Bore Kit\u003c\/strong\u003e. This 52mm cast iron cylinder is designed for riders who demand the maximum displacement possible from the 139QMB platform. Engineered for durability and high-heat tolerance, this kit provides a massive boost in torque and top-end speed.\u003c\/p\u003e\u003ch3\u003ePerformance Highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Displacement:\u003c\/strong\u003e Increases your engine to a true 88cc for superior hill climbing and acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast Iron Durability:\u003c\/strong\u003e Provides excellent longevity and reliability for daily commuting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Honing:\u003c\/strong\u003e Optimized cylinder walls for reduced friction and improved ring seating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional Grade:\u003c\/strong\u003e The preferred choice for \"screamer\" builds across the scooter racing community.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDetailed Model Fitment\u003c\/h3\u003e\u003cp\u003eThis kit fits nearly all \u003cstrong\u003e4-stroke 50cc (QMB139 \/ GY6 50)\u003c\/strong\u003e scooter engines. Below are the most popular compatible models:\u003c\/p\u003e\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 15px;\"\u003e\u003ctbody\u003e\n\u003ctr style=\"background-color: #f2f2f2; text-align: left;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eBrand\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCompatible Models\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eKymco\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eAgility 50, Like 50, Super 8 50, People 50 (4T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eTaoTao\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eATM50-A1, Pony 50, Thunder, VIP Future Champion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eLance \/ SYM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCali Classic 50, Havana 50, PCH 50, SYM Fiddle II 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eIce Bear \/ Wolf\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eMaddog 50 (Gen I-V), Wolf RX-50, Wolf Lucky, Islander\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cblockquote style=\"margin: 20px 0; padding: 15px; background: #fff5f5; border-left: 5px solid #ff4d4d;\"\u003e\n\u003cstrong\u003eCRITICAL INSTALLATION NOTE:\u003c\/strong\u003e This is a 52mm kit. Most 139QMB engine cases \u003cstrong\u003erequire machining or cutting\u003c\/strong\u003e to fit the larger cylinder skirt. We highly recommend using the \u003cstrong\u003eNCY Engine Bore Tool\u003c\/strong\u003e \u003cspan\u003eOrder part number \u003c\/span\u003e\u003ca href=\"https:\/\/www.scooterworks.com\/NCY-Case-Boring-Tool-GY6-P1868.aspx\"\u003e1400-1001\u003c\/a\u003e if you do not have access to a machine shop.\u003c\/blockquote\u003e\u003ch3\u003eRecommended Support Mods\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig Valve Head:\u003c\/strong\u003e Use with the \u003ca href=\"#\"\u003eNCY 50mm Big Valve Head\u003c\/a\u003e for optimal flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankcase Pressure:\u003c\/strong\u003e Install an \u003cstrong\u003eNCY Decompression Tube\u003c\/strong\u003e to manage increased engine pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJetting:\u003c\/strong\u003e Carburetor re-jetting is required (Typically #85-#95 Main Jet depending on altitude).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003e*Not legal for use in California on pollution-controlled vehicles. For off-road\/track use only.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003eNCY GY6 50\/139QMB 52mm Cast Iron Cylinder Kit w\/o head\u003c\/p\u003e\u003ch3 style=\"color: #983d3c;\"\u003eThis product is not intended for use on public roads or land.\u003c\/h3\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":46756517675288,"sku":"1100-1248","price":149.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/products\/1100-1248_a695e1d5-c1fb-4bf5-b035-f866f44a954b.jpg?v=1695268868","url":"https:\/\/www.scooterworks.com\/products\/ncy-cylinder-kit-cast-52mm-88cc-qmb139-1100-1248","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}