{"product_id":"39mm-gy6-50cc-139qmb-piston","title":"39mm GY6 50cc (139QMB) Piston","description":"\u003ch2\u003e39mm Piston for 50cc QMB139 Engines\u003c\/h2\u003e\u003cp\u003eThis 39mm piston is designed specifically for 50cc 4-stroke QMB139 engines, making it an important component for proper engine function. It plays a key role in maintaining a tight seal within the combustion chamber. Replacing worn pistons and rings can prevent issues like smoke, excessive oil consumption, and low compression. This part is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that you should consider when ensuring your engine operates efficiently.\u003c\/p\u003e\u003ch3\u003eWhen to Replace It\u003c\/h3\u003e\u003cp\u003eThis piston should be replaced when you notice symptoms such as engine smoking or reduced power output, which may indicate worn rings. Regular maintenance of this part helps to maintain engine efficiency and prolong the life of your scooter.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 39mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 33mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston Pin:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 17.25mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCirclips:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis piston is compatible with various makes and models featuring the QMB139 50cc\/49cc engine.\u003c\/p\u003e\u003cul\u003e\u003cli\u003eGY6 50cc engines\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-pistons-rings\"\u003eScooter Pistons \u0026amp; Piston Rings\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":52795165999335,"sku":"25-902421","price":13.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2245\/9711\/files\/39mm-gy6-50cc-139qmb-piston-1.jpg?v=1791584115","url":"https:\/\/www.magiccars.com\/products\/39mm-gy6-50cc-139qmb-piston","provider":"MagicCars","version":"1.0","type":"link"}