{"product_id":"gy6-67mm-4v-cylinder-head","title":"GY6 67mm 4V Cylinder Head","description":"\u003ch2\u003eGY6 67mm 4V Cylinder Head for B-Case Engines\u003c\/h2\u003e\u003cp\u003eThis 67mm (232cc) cylinder head for GY6 4-stroke engines with a B-case layout is a dependable performance option for your scooter. The kit comes with a camshaft, roller rockers, and anodized head and cam covers, so you get a full set of parts for the top end of your engine. Among \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e, it suits riders who want more power and steadier running. It is designed to work with a variety of makes and models.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cp\u003eThe head uses a 23mm exhaust valve and a 25mm intake valve, which support smooth airflow and better combustion. Its exhaust port measures 27mm and its intake port 30mm, helping exhaust gases leave and fresh charge enter more easily. At 144mm overall height, it is sized for B-case engines with 57mm stud spacing.\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cp\u003eA 96L cam chain is needed to fit this head. The chain is not included. Set valve lash to 0.10mm on the intake side and 0.12mm on the exhaust side, as these clearances matter for proper engine operation. This part is intended for off-road use only and is not suitable for public roads or land.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Diameter:\u003c\/strong\u003e 23mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Diameter:\u003c\/strong\u003e 25mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Port Diameter:\u003c\/strong\u003e 27mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Port Diameter:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 144mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStud Spacing:\u003c\/strong\u003e 57mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 B-case four-stroke engine builds with 57mm stud spacing and a 67mm cylinder (232cc build)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 QMI\/QMJ 152\/157 engine families (B-case build with 57mm stud spacing and compatible 67mm cylinder configuration)\u003c\/li\u003e\n\u003cli\u003eOther compatible makes and models (same B-case, stud-spacing, cylinder, and valvetrain requirements)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check the cylinder stud spacing on your engine. This head needs 57mm. You will also need a 96-link cam chain, which is sold separately.\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-heads\"\u003eScooter Cylinder Heads \u0026amp; Valves\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":51135761776697,"sku":"TT-16441","price":825.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-67mm-4v-cylinder-head-1.jpg?v=1794349714","url":"https:\/\/www.trendtimes.com\/products\/gy6-67mm-4v-cylinder-head","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}