{"product_id":"gy6-58-5mm-big-bore-kit-forged-piston","title":"GY6 58.5mm Big Bore Kit - Forged Piston","description":"\u003ch2\u003e58.5mm Big Bore Kit for GY6 125cc and 150cc Engines\u003c\/h2\u003e\u003cp\u003eThis 58.5mm big bore kit is built for GY6 4-stroke engines in the 125cc and 150cc range. A forged piston comes with the kit and raises displacement to 155cc. It is one of the \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e that can add performance without any crankcase work, and it can be fitted by someone with basic mechanical ability.\u003c\/p\u003e\u003ch3\u003eKit Build\u003c\/h3\u003e\u003cp\u003eThe piston in this kit is forged, a construction chosen for its durability and dependability. The cylinder stands 91.5mm tall and its outer sleeve measures 60.3mm across. The stud spacing is 76.5mm, so the kit is sized to sit correctly on compatible GY6 engines.\u003c\/p\u003e\u003ch3\u003eFitting Notes\u003c\/h3\u003e\u003cp\u003eNo crankcase modifications are needed with the 58.5mm Big Bore Kit. It bolts straight onto the engine, which makes it a practical choice for anyone wanting more power without a large amount of mechanical work.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 58.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Sleeve Diameter:\u003c\/strong\u003e 60.3mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement Increase:\u003c\/strong\u003e 155cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height (Cylinder):\u003c\/strong\u003e 91.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStud Spacing:\u003c\/strong\u003e 76.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 150cc and 125cc 4-stroke engines with 60.3mm outer sleeve diameter and 76.5mm stud spacing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 QMI\/QMJ 152\/157 (150cc and 125cc 4-stroke engines)\u003c\/li\u003e\n\u003cli\u003eVarious unlisted makes and models with GY6 engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check your cylinder's outer sleeve diameter. It needs to be 60.3mm, and the stud spacing needs to be 76.5mm for the kit to bolt on.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/chinese-scooter-parts\"\u003eChinese Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-cylinder-kits\"\u003eScooter Big Bore \u0026amp; Cylinder Kits\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-pistons-rings\"\u003eScooter Pistons \u0026amp; Piston Rings\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51134440472633,"sku":"TT-15669","price":181.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-58-5mm-big-bore-kit-forged-piston-1.jpg?v=1794343957","url":"https:\/\/www.trendtimes.com\/products\/gy6-58-5mm-big-bore-kit-forged-piston","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}