{"product_id":"gy6-50cc-139qmb-cylinder-head-emissions","title":"GY6 50cc (139QMB) Cylinder Head - Emissions","description":"\u003ch2\u003eGY6 50cc Cylinder Head for 139QMB Engines\u003c\/h2\u003e\u003cp\u003eThe GY6 50cc Cylinder Head is designed specifically for 50cc 4-stroke QMB139 engines, featuring an advanced emissions control system known as PAIR, which stands for Pulsed Secondary Air Injection System. This component helps to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions by directing air into the exhaust flow. It is one of the key \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that ensures your engine runs cleaner and more efficiently.\u003c\/p\u003e\u003ch3\u003eEmissions Control System\u003c\/h3\u003e\u003cp\u003eThis cylinder head incorporates the PAIR system, which plays an important role in minimizing harmful emissions from your scooter. By introducing fresh air into the exhaust, the PAIR system improves combustion efficiency and helps to meet environmental standards. This feature is important for owners looking to reduce their environmental impact while maintaining engine performance.\u003c\/p\u003e\u003ch3\u003eSpecifications and Dimensions\u003c\/h3\u003e\u003cp\u003eThe GY6 50cc Cylinder Head features precise dimensions that ensure a perfect fit for your engine. It has a bore size of 39mm, with an intake port diameter of 17mm and an exhaust port diameter of 18mm. These specifications are necessary for maintaining the correct balance of air and fuel, which is important for engine performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 39mm Bore\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Port Diameter:\u003c\/strong\u003e 17mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Port Diameter:\u003c\/strong\u003e 18mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission Control System:\u003c\/strong\u003e Pulsed Secondary Air Injection (PAIR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e QMB139 50cc\/49cc Engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis cylinder head is compatible with various makes and models that utilize the QMB139 engine. Ensure your scooter is equipped with a 50cc 4-stroke engine to benefit from this replacement part.\u003c\/p\u003e\u003cul\u003e\u003cli\u003eVarious makes\/models\u003c\/li\u003e\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\/gy6-50cc-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":"Magic Cars","offers":[{"title":"Default Title","offer_id":52795146567911,"sku":"25-901797","price":44.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/gy6-50cc-139qmb-cylinder-head-emissions-1.jpg?v=1791583975","url":"https:\/\/www.magiccars.com\/products\/gy6-50cc-139qmb-cylinder-head-emissions","provider":"MagicCars","version":"1.0","type":"link"}