{"product_id":"gy6-61mm-171cc-no-cut-big-bore-kit","title":"GY6 61mm 171cc No-Cut Big Bore Kit","description":"\u003ch2\u003e61mm Big Bore Upgrade for GY6 125cc and 150cc Motors\u003c\/h2\u003e\u003cp\u003eThis 61mm big bore setup raises the displacement of supported four-stroke GY6 125cc and 150cc engines to roughly 171.3cc. It bolts in without any modification to the engine case, which makes it a practical pick for riders wanting more pull and power. Among \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e, it is a straightforward way to improve acceleration. Everything needed for the install comes in the box, so it suits both experienced builders and home mechanics.\u003c\/p\u003e\u003ch3\u003eBuild Quality and Included Parts\u003c\/h3\u003e\u003cp\u003eThe cylinder is cast from aluminum, a material that moves heat away well. The piston uses a short-skirt design, which cuts down on reciprocating weight and helps the engine respond more quickly. The package covers the cylinder, piston, compression rings, wrist pin, fasteners, and gaskets, so you have what you need for a complete fitting.\u003c\/p\u003e\u003ch3\u003eEngine Match and Compatibility\u003c\/h3\u003e\u003cp\u003eThis kit is built for GY6 125cc–150cc four-stroke engines stamped with QMI or QMJ codes. It works with GY6-A engine cases that have a 54mm cylinder stud spacing. Confirm your engine's specs before ordering. It does not fit GY6 B-Block or 161QMK engines.\u003c\/p\u003e\u003ch3\u003eTechnical Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 61mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e Approximately 171.3cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Cylinder Skirt Diameter:\u003c\/strong\u003e 62.99mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Stud Spacing:\u003c\/strong\u003e 54mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 603C02GY661\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Taiwan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 150cc (157QMJ) engines with GY6-A case, 54mm stud spacing, 62.99mm skirt clearance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Vehicles\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 150cc (157QMJ) (GY6-A case, 54mm cylinder stud spacing, 62.99mm skirt clearance)\u003c\/li\u003e\n\u003cli\u003eBuddy 150 and Blur 150 (matching engine and case dimensions)\u003c\/li\u003e\n\u003cli\u003eTaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR, SYM and other QMI\/QMJ-based GY6 scooters (select models)\u003c\/li\u003e\n\u003cli\u003eHammerhead 150, Trailmaster 150, Yerf-Dog and Carter Talon go-karts and buggies (select models with matching QMI\/QMJ engines)\u003c\/li\u003e\n\u003cli\u003eMatching 157QMJ, 1P57QMJ, 152QMI and BN157QMJ configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSelection tip:\u003c\/strong\u003e Verify the GY6-A case and 54mm cylinder stud spacing before purchase, and make sure the 62.99mm skirt will clear your case opening.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePlacement:\u003c\/strong\u003e Refer to part #1 on the cylinder diagram for the GY6 150cc (157QMJ).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAlternate option:\u003c\/strong\u003e If you want the 63mm 180cc version for GY6 125cc and 150cc, see \u003ca href=\"\/products\/63mm-180cc-big-bore-kit-for-gy6-125cc-150cc\"\u003e63mm 180cc Big Bore Kit for GY6 125cc \u0026amp; 150cc\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse further:\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-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138788786233,"sku":"TT-26754","price":171.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/61mm-171cc-no-cut-big-bore-kit-for-gy6-1.jpg?v=1794377796","url":"https:\/\/www.trendtimes.com\/products\/gy6-61mm-171cc-no-cut-big-bore-kit","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}