{"product_id":"gy6-57mm-cylinder-head-pair-type","title":"GY6 57mm Cylinder Head - PAIR Type","description":"\u003ch2\u003e57mm Cylinder Head for GY6 150cc Engines\u003c\/h2\u003e\u003cp\u003eThis 57mm PAIR Cylinder Head is specifically designed for GY6 150cc engines, offering a complete replacement solution for your engine rebuild. It features a fully assembled design that includes the necessary components to replace a damaged cylinder head effectively. With this part, you can restore your engine's performance without starting from scratch. It is one of the straightforward \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 scooter parts\u003c\/a\u003e to replace, thanks to its comprehensive assembly and compatibility with the engine layout.\u003c\/p\u003e\u003ch3\u003eComplete Valve Assembly\u003c\/h3\u003e\u003cp\u003eThe cylinder head comes with a fully integrated valve assembly, which makes the replacement process simpler. With the intake and exhaust valves along with their springs already in place, you can save both time and effort during your engine rebuild. This feature is particularly beneficial for those looking to improve the performance of their GY6 engine.\u003c\/p\u003e\u003ch3\u003ePAIR-Compatible Emissions System\u003c\/h3\u003e\u003cp\u003eThis cylinder head includes a design that supports the Pulsed Secondary Air Injection (PAIR) system, which helps to reduce harmful emissions by introducing air into the exhaust flow. This function is important for meeting emissions standards while ensuring your engine runs efficiently. For off-road vehicles that do not have this system, the PAIR feature can be sealed off as necessary during installation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Complete emissions-type cylinder head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Platform:\u003c\/strong\u003e GY6-A four-stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e 150cc QMJ157\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Size:\u003c\/strong\u003e 57 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 60.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead-Stud Spacing:\u003c\/strong\u003e 54 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal Head-Stud Spacing:\u003c\/strong\u003e 76.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal Valve-Cover Bolt Spacing:\u003c\/strong\u003e 144 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Diameter:\u003c\/strong\u003e 29 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Diameter:\u003c\/strong\u003e 23.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmissions Feature:\u003c\/strong\u003e PAIR secondary-air system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Installed valves and springs; intake and exhaust studs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis cylinder head is compatible with GY6-A 150cc QMJ157 \/ 157QMJ engines. Be sure that the 57 mm bore size and 54 mm stud spacing fit your existing setup before installation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6-A 150cc QMJ157 \/ 157QMJ\u003c\/li\u003e\n\u003cli\u003eGY6 QMI\/QMJ 152\/157 applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.\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":"Magic Cars","offers":[{"title":"Default Title","offer_id":52795170750695,"sku":"25-902549","price":76.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/gy6-57mm-cylinder-head-pair-type-1.jpg?v=1791584152","url":"https:\/\/www.magiccars.com\/products\/gy6-57mm-cylinder-head-pair-type","provider":"MagicCars","version":"1.0","type":"link"}