{"product_id":"47mm-gy6-50cc-139qmb-piston-kit","title":"47mm GY6 50cc (139QMB) Piston Kit","description":"\u003ch2\u003e47mm Piston Assembly for GY6 50cc Engines\u003c\/h2\u003e\u003cp\u003eThis 47mm piston assembly is built for 50cc QMB139 4-stroke engines. Everything needed for a full replacement is included: the piston, rings, wrist pin, and circlips. It belongs to the group of \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e that owners commonly replace during engine servicing or when upgrading performance. Installed correctly, it helps the engine run properly and last.\u003c\/p\u003e\u003ch3\u003ePart Dimensions\u003c\/h3\u003e\u003cp\u003eThe piston has a 47mm outer diameter and an overall height of 34.4mm. The compression height is 17.25mm, the wrist pin diameter is 13mm, and the wrist pin length is 36.8mm. Matching these measurements is key to a correct fit and good engine performance.\u003c\/p\u003e\u003ch3\u003eFitting Notes\u003c\/h3\u003e\u003cp\u003eSwapping the piston in a GY6 50cc engine is manageable for anyone comfortable with scooter repair. Check that every component is compatible and have the right tools ready before starting. Signs that a new piston may be due include lower compression and unfamiliar noises from the engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 47mm outer diameter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Height:\u003c\/strong\u003e 34.4mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression Height:\u003c\/strong\u003e 17.25mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin Diameter:\u003c\/strong\u003e 13mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrist Pin Length:\u003c\/strong\u003e 36.8mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Piston, Pin, Rings, Circlips\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 50cc QMB139 4-stroke engines with a 47mm cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eGY6 50cc QMB139 4-stroke engines (47mm cylinder and head kit)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Select a piston that matches a 47mm bore, 13mm wrist pin, and 17.25mm compression height. The cylinder needs to be the 47mm 50cc QMB139 type.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse related:\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":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51134195957817,"sku":"TT-14771","price":20.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/47mm-gy6-50cc-139qmb-piston-kit-1.jpg?v=1794340096","url":"https:\/\/www.trendtimes.com\/products\/47mm-gy6-50cc-139qmb-piston-kit","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}