{"product_id":"180cc-gy6-big-bore-kit-63mm-forged-piston","title":"180cc GY6 Big Bore Kit - 63mm Forged Piston","description":"\u003ch2\u003e180cc Big Bore Kit for GY6 125cc and 150cc Engines\u003c\/h2\u003e\u003cp\u003eThis 63 mm forged piston big bore kit is built to raise the performance of supported GY6 125cc and 150cc four-stroke engines. Increasing the displacement to roughly 180cc gives you a stronger base for torque and acceleration. It belongs to our \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e range and can make a clear difference to how your engine performs.\u003c\/p\u003e\u003ch3\u003eKey Components\u003c\/h3\u003e\u003cp\u003eEverything needed for the upgrade comes in the box: a finned cylinder to help with cooling, a forged piston, piston rings, a wrist pin, retaining clips, and the gaskets required for fitting. The fins work to shed heat, which helps the engine hold steady performance. Together these parts should give you a clearly stronger power delivery.\u003c\/p\u003e\u003ch3\u003eInstallation Requirements\u003c\/h3\u003e\u003cp\u003eFitting this big bore kit means the crankcase must be modified, so it is more involved than a straight swap. You will need the correct tools, including an engine case boring tool, to do the job properly. Plan for the extra work needed to make room for the new cylinder and piston.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine application:\u003c\/strong\u003e Suits GY6 125cc \/ 150cc four-stroke engines; not intended for QMK or 169cc engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 63 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e Roughly 180cc, varying with crankshaft stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter sleeve diameter:\u003c\/strong\u003e 64.9 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder height:\u003c\/strong\u003e 90 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist pin:\u003c\/strong\u003e 15 mm diameter × 48 mm length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder-stud spacing:\u003c\/strong\u003e 54 × 54 mm center-to-center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 125cc and 150cc four-stroke starting engines (QMI\/QMJ configurations) once the crankcase has been bored\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 125cc and 150cc four-stroke starting engines (157QMJ, 152QMI, YN1P57QMJ, JJ157QMJ, 1P57QMJ, BN157QMJ, 1P52FMI, 154FMI and other QMI\/QMJ configurations; GY6-A type)\u003c\/li\u003e\n\u003cli\u003e54 × 54 mm cylinder-stud spacing, 15 mm wrist pin, and crankcase modification required\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Look at the engine code on the case. It needs to be a 125cc or 150cc GY6-A engine with 54 × 54 mm cylinder-stud spacing, and the case must be bored to accept the 64.9 mm sleeve.\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":51134445355065,"sku":"TT-15719","price":221.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/180cc-gy6-big-bore-kit-63mm-forged-piston-1.jpg?v=1794344031","url":"https:\/\/www.trendtimes.com\/products\/180cc-gy6-big-bore-kit-63mm-forged-piston","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}