{"product_id":"gy6-50cc-139qmb-cylinder-head","title":"GY6 50cc (139QMB) Cylinder Head","description":"\u003ch2\u003eGY6 50cc Cylinder Head for 139QMB Motors\u003c\/h2\u003e\u003cp\u003eThis head is built to swap in for original parts on scooters running 139QMB motors. It offers dependable operation for your scooter. Owners frequently pick it during routine service or when upgrading. It belongs to the range of \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that support steady engine output and day-to-day function.\u003c\/p\u003e\u003ch3\u003eEngine Code Match\u003c\/h3\u003e\u003cp\u003eThis head suits 50cc and 80cc motors built on the 139QMB platform. It is listed for engine codes such as 139QMA, YN139QMB, and BN139QMB. If your engine code includes \"QM\" or \"FM,\" this part should fit your scooter.\u003c\/p\u003e\u003ch3\u003eFitting Tips\u003c\/h3\u003e\u003cp\u003eSwapping the head is simple for anyone comfortable with scooter upkeep. Take care to line it up correctly during fitting so the engine keeps running as it should. Check whether other pieces, like gaskets and valve assemblies, also need replacing so the job is complete.\u003c\/p\u003e\u003ch3\u003eSpecs\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 39mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Bolt Hole Spacing:\u003c\/strong\u003e 49.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Bolt Hole Spacing:\u003c\/strong\u003e 44.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 1100-1331 (gasket), 1100-1328 (valve assembly)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 139QMB-based 50cc and 80cc GY6 engines (139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 50cc engines with code 139QMB, 139QMA, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB\u003c\/li\u003e\n\u003cli\u003eGY6 80cc engines with code 147QMD and other QMA\/QMB models\u003c\/li\u003e\n\u003cli\u003eAny engine with a code containing \"QM\" or \"FM\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Compare your engine code with the list, or confirm it contains \"QM\" or \"FM\"; the head requires a 39mm bore and 44.75mm intake and 49.75mm exhaust bolt spacing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse further:\u003c\/strong\u003e \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc Scooter Parts (139QMB)\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-parts\"\u003eScooter Parts\u003c\/a\u003e\u003c\/p\u003e","brand":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51138782724153,"sku":"TT-26721","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/cylinder-head-for-gy6-50cc-139qmb-1.jpg?v=1794377748","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-cylinder-head","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}