{"product_id":"ncy-88cc-big-bore-kit-52mm-139qmb-gy6-50","title":"NCY 88cc Big Bore Kit (52mm) - 139QMB \/ GY6 50","description":"\u003cp\u003eNCY 52mm 88cc Big Bore Kit - Extreme Power for QMB139 Engines Turn your 49cc\/50cc scooter into a high-performance machine with the NCY 88cc Big Bore Kit . 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. Performance Highlights Maximum Displacement: Increases your engine to a true 88cc for superior hill climbing and acceleration. Cast Iron Durability: Provides excellent longevity and reliability for daily commuting. Precision Honing: Optimized cylinder walls for reduced friction and improved ring seating. Professional Grade: The preferred choice for \"screamer\" builds across the scooter racing community. Detailed Model Fitment This kit fits nearly all 4-stroke 50cc (QMB139 \/ GY6 50) scooter engines. Below are the most popular compatible models: Brand Compatible Models Kymco Agility 50, Like 50, Super 8 50, People 50 (4T) TaoTao ATM50-A1, Pony 50, Thunder, VIP Future Champion Lance \/ SYM Cali Classic 50, Havana 50, PCH 50, SYM Fiddle II 50 Ice Bear \/ Wolf Maddog 50 (Gen I-V), Wolf RX-50, Wolf Lucky, Islander CRITICAL INSTALLATION NOTE: This is a 52mm kit. Most 139QMB engine cases require machining or cutting to fit the larger cylinder skirt. We highly recommend using the NCY Engine Bore Tool Order part number 1400-1001 if you do not have access to a machine shop. Recommended Support Mods Big Valve Head: Use with the NCY 50mm Big Valve Head for optimal flow. Crankcase Pressure: Install an NCY Decompression Tube to manage increased engine pressure. Jetting: Carburetor re-jetting is required (Typically #85-#95 Main Jet depending on altitude). *Not legal for use in California on pollution-controlled vehicles. For off-road\/track use only. NCY GY6 50\/139QMB 52mm Cast Iron Cylinder Kit w\/o head This product is not intended for use on public roads or land.\u003c\/p\u003e","brand":"ncy","offers":[{"title":"Default Title","offer_id":48045149159611,"sku":"1100-1248","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/1100-1248_a695e1d5-c1fb-4bf5-b035-f866f44a954b.jpg?v=1783052434","url":"https:\/\/thriftyscooters.com\/products\/ncy-88cc-big-bore-kit-52mm-139qmb-gy6-50","provider":"Thrifty Scooters","version":"1.0","type":"link"}