{"product_id":"gy6-50cc-139qmb-69mm-valve-rebuild-kit","title":"GY6 50cc (139QMB) 69mm Valve Rebuild Kit","description":"\u003ch2\u003eValve Rebuild Kit for GY6 50cc (139QMB) Engines\u003c\/h2\u003e\u003cp\u003eThis valve rebuild kit is made for 50cc 4-stroke QMB139 engines. It supplies everything needed for a full valve assembly, which can help restore performance and dependability. It is one of the \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e we carry, and it plays a key role in keeping the engine running properly, supporting stronger compression and better efficiency. Replacing these components on a regular basis can head off larger engine issues and keep your scooter running smoothly.\u003c\/p\u003e\u003ch3\u003eWhat Comes in the Kit\u003c\/h3\u003e\u003cp\u003eThe kit contains a full set of pieces, including intake and exhaust valves, a pair of valve springs, valve washers, seals, retainers, and keepers. Every item has its own job in the engine, together controlling the flow of air and fuel accurately, which is essential for proper combustion and engine output.\u003c\/p\u003e\u003ch3\u003eSigns It May Be Time to Replace Them\u003c\/h3\u003e\u003cp\u003eThink about replacing these valve parts if you notice lower power, odd engine sounds, or a general drop in performance. Keeping these components maintained helps prevent bigger problems later and keeps your scooter running efficiently.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Length:\u003c\/strong\u003e 69mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Diameter:\u003c\/strong\u003e 5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Valve Diameter:\u003c\/strong\u003e 18.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Diameter:\u003c\/strong\u003e 16mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 50cc 4-stroke QMB139 engines (GY6 type), 69mm valve length\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eQMB139 50cc\/49cc 4-stroke engine (69mm valve length, 5mm shaft)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Check that the valve length and stem diameter match your engine: 69mm length with 5mm shafts, with an 18.5mm intake head and a 16mm exhaust head.\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":"Trend Times Toy Stores","offers":[{"title":"Default Title","offer_id":51134469439545,"sku":"TT-15952","price":14.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-50cc-139qmb-69mm-valve-rebuild-kit-1.webp?v=1794344329","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-69mm-valve-rebuild-kit","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}