{"product_id":"gy6-50cc-139qmb-rocker-arms-for-69mm-length-valve","title":"GY6 50cc (139QMB) Rocker Arms for 69mm Length Valve","description":"\u003ch2\u003eRocker Arms for 50cc 4-Stroke Engines\u003c\/h2\u003e\u003cp\u003eThese rocker arms are built for cylinder heads that use 69mm valves on 50cc QMB139 4-stroke engines. Correct valve action is central to good engine output, so this component plays a direct role in how the engine runs. It belongs to the range of \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e often looked at when troubleshooting weak compression or a ticking noise. Swapping out worn rocker arms can help the engine breathe properly and can stop further wear from developing.\u003c\/p\u003e\u003ch3\u003eSigns It Needs Changing\u003c\/h3\u003e\u003cp\u003eConsider replacing the rocker arms if you hear ticking, notice low compression, or find burnt valves. Any of these may point to the need for work on the cylinder head to get the engine running correctly again. Before fitting a new set, check that it suits your cylinder head's bore size and engine code.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 55.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Universal GY6 50cc 4-stroke QMB139 engines with 69mm valves\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eSuitable for:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBaja SC50\u003c\/li\u003e\n\u003cli\u003eKymco (69mm valve heads)\u003c\/li\u003e\n\u003cli\u003ePanterra (69mm valve heads)\u003c\/li\u003e\n\u003cli\u003eQMB139 50cc\/49cc engines (69mm valves)\u003c\/li\u003e\n\u003cli\u003eQingqi (69mm valve heads)\u003c\/li\u003e\n\u003cli\u003eRoketa (69mm valve heads)\u003c\/li\u003e\n\u003cli\u003eSUNL (69mm valve heads)\u003c\/li\u003e\n\u003cli\u003eVarious unlisted makes and models with 69mm valve heads\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Make sure the valve length on your head matches. This part is intended for heads with 69mm valves and measures 55.5mm in length.\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":51134471372857,"sku":"TT-15972","price":9.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/gy6-50cc-139qmb-rocker-arms-for-69mm-length-valve-1.jpg?v=1794344360","url":"https:\/\/www.trendtimes.com\/products\/gy6-50cc-139qmb-rocker-arms-for-69mm-length-valve","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}