{"product_id":"gy6-150cc-157qmj-engines-cylinder-head-57mm","title":"GY6 150cc (157QMJ) Engines Cylinder Head 57mm","description":"\u003ch2\u003e57mm Cylinder Head for GY6 150cc Engines\u003c\/h2\u003e\u003cp\u003eThis cast aluminum cylinder head is built for GY6 150cc engines, namely the 157QMJ models. It serves as a dependable swap-in for a cylinder head that has been damaged or has worn down. Keeping this part in good condition matters for overall engine performance. It is one of the simpler \u003ca href=\"\/collections\/gy6-150cc-parts\"\u003eGY6 150cc scooter parts\u003c\/a\u003e you can fit yourself at home.\u003c\/p\u003e\u003ch3\u003eConstruction and Features\u003c\/h3\u003e\u003cp\u003eThis head is manufactured to OEM specifications and has a 57.4mm bore diameter. Valve seats and guides come already fitted, which simplifies the installation process. Both the intake and exhaust ports measure 24mm and use M6 threaded connections. The design is meant to work with a range of GY6-A block engines.\u003c\/p\u003e\u003ch3\u003eWhen to Replace Your Cylinder Head\u003c\/h3\u003e\u003cp\u003eIf your engine begins to overheat or loses power, it may be time to inspect or replace the cylinder head. Leaving a damaged or worn head in service can cause significant engine damage. Swapping it out quickly can bring back both performance and dependability.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Diameter:\u003c\/strong\u003e 57mm (57.4mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Port Diameter:\u003c\/strong\u003e 24mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Port Diameter:\u003c\/strong\u003e 24mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort Threads:\u003c\/strong\u003e M6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Seats:\u003c\/strong\u003e Pre-installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Guides:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 150cc (157QMJ) engines with a 57mm bore, including 157QMJ, JJ157QMJ, 1P57QMJ and BN157QMJ codes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 150cc (157QMJ) (57mm bore, 157QMJ, JJ157QMJ, 1P57QMJ and BN157QMJ codes)\u003c\/li\u003e\n\u003cli\u003eOther 157QMJ-based 150cc engines with a 57mm bore (listed as other QMJ models)\u003c\/li\u003e\n\u003cli\u003e152QMI 125cc\/150cc GY6-A engines (listed in the features)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check that your bore is 57mm and that the engine code stamped on your motor matches one of these: 157QMJ, JJ157QMJ, 1P57QMJ or BN157QMJ. Confirm this before placing your order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere it goes:\u003c\/strong\u003e It is part #1 on the cylinder head diagram for the GY6 150cc (157QMJ).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOther versions:\u003c\/strong\u003e For a Genuine GY6 125cc head with valve guides, see \u003ca href=\"\/products\/cylinder-head-with-valve-guides-for-genuine-gy6-125-cc\"\u003eCylinder Head (With Valve Guides) for Genuine, GY6 125 cc\u003c\/a\u003e. For GY6 171cc big valve kits at 61mm, see \u003ca href=\"\/products\/gy6-big-valve-cylinder-head-61mm-171cc-kits\"\u003eGY6 Big Valve Cylinder Head - 61mm 171cc Kits\u003c\/a\u003e. For a Genuine\/GY6 big valve head at 58.5mm with 2 valves, see \u003ca href=\"\/products\/genuine-gy6-big-valve-cylinder-head-58-5mm-2-valve\"\u003eGenuine\/GY6 Big Valve Cylinder Head (58.5mm, 2 Valve)\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-150cc-parts\"\u003eGY6 150cc Scooter Parts (157QMJ)\u003c\/a\u003e · \u003ca href=\"\/collections\/gy6-scooter-parts\"\u003eGY6 Scooter Parts\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-cylinder-heads\"\u003eScooter Cylinder Heads \u0026amp; Valves\u003c\/a\u003e · \u003ca href=\"\/collections\/scooter-engines\"\u003eScooter Engines \u0026amp; Engine Parts\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":51138796748857,"sku":"TT-26794","price":41.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cylinder-head-57mm-for-gy6-150cc-157qmj-engines-1.jpg?v=1794377857","url":"https:\/\/www.trendtimes.com\/products\/gy6-150cc-157qmj-engines-cylinder-head-57mm","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}