{"product_id":"a9-camshaft-gy6-50cc-139qmb-high-lift-performance","title":"A9 Camshaft GY6 50cc (139QMB) - High-Lift Performance","description":"\u003ch2\u003eA9 High-Lift Camshaft for GY6 50cc Engines\u003c\/h2\u003e\u003cp\u003eThe A9 High-Lift Performance Camshaft is made for GY6 50cc (139QMB) scooters. It is built to raise engine output, especially at higher RPMs. Among \u003ca href=\"\/collections\/gy6-50cc-parts\"\u003eGY6 50cc scooter parts\u003c\/a\u003e, it targets mid-range power and top speed. It suits riders moving to big bore kits from 72cc up to 100cc, as its design supports better airflow and efficiency.\u003c\/p\u003e\u003ch3\u003eHigh-Lift Profile for Greater Power Output\u003c\/h3\u003e\u003cp\u003eThis camshaft uses a strongly aggressive lift profile, rising above stock specifications, which makes it a popular pick among performance-minded riders. Pre-installed low-friction bearings help the shaft turn smoothly, and the hardened steel alloy body resists wear over long use. Together these traits support dependable running under demanding conditions.\u003c\/p\u003e\u003ch3\u003eFitting and Compatibility\u003c\/h3\u003e\u003cp\u003eThe A9 camshaft drops in as a replacement for the factory 139QMB camshaft and, in standard installations, does not require any machining of the cylinder head. It works with a broad range of 4-stroke 50cc Chinese scooters, giving riders many options for an engine upgrade.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Hardened steel alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Lobe:\u003c\/strong\u003e 26.50mm (±0.05mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Lobe:\u003c\/strong\u003e 26.35mm (±0.05mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e Pre-installed 16002\/P6 rated ball bearings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e ISO 9001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Complete camshaft with pre-installed bearings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GY6 50cc 4-stroke engines with 139QMA or 139QMB heads, incl. 1P39QMB, YN139QMB, BN139QMB, 147QMD\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 50cc 4-stroke engines with 139QMA or 139QMB heads (most Chinese 50cc scooters)\u003c\/li\u003e\n\u003cli\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2\u003c\/li\u003e\n\u003cli\u003eYN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB\u003c\/li\u003e\n\u003cli\u003eBN139QMB, 147QMD\u003c\/li\u003e\n\u003cli\u003eOther QMA and QMB variants\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Compare the engine code cast into your engine (for example, 139QMB) with the codes above. Codes containing \"QM\" or \"FM\" are the most likely match.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBrowse 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":51135928631353,"sku":"TT-16864","price":17.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0665\/3358\/9049\/files\/rdln-a9-camshaft-gy6-50cc-50cc-139qmb-high-lift-performance-1.webp?v=1794350165","url":"https:\/\/www.trendtimes.com\/products\/a9-camshaft-gy6-50cc-139qmb-high-lift-performance","provider":"Trend Times Toy Stores","version":"1.0","type":"link"}