{"product_id":"gy6s-1100-1555-rdln-performance-camshaft-a9-for-50cc-100cc-qmb139-engines","title":"RDLN PERFORMANCE CAMSHAFT *A9* FOR 50cc - 100cc QMB139 ENGINES","description":"\u003ch2\u003eRDLN A9 High-Lift Performance Camshaft\u003c\/h2\u003e \u003ch3\u003eFits 50cc, 72cc, 80cc \u0026amp; 100cc GY6 139QMA \/ 139QMB Engines\u003c\/h3\u003e \u003cp\u003eTake your GY6 engine to the next level with the \u003cstrong\u003eRDLN A9 High-Lift Performance Camshaft\u003c\/strong\u003e. Engineered specifically for the 139QMB platform, the proven A9 cam profile increases valve lift and duration, allowing your engine to move more air and fuel at higher RPMs. The result is stronger mid-range acceleration, improved throttle response, and increased top-end power—especially on engines equipped with big bore kits and other performance upgrades.\u003c\/p\u003e \u003cp\u003eWhether you're building a reliable daily rider or a high-performance GY6 scooter, the A9 camshaft is one of the most effective bolt-on upgrades available.\u003c\/p\u003e \u003ch2\u003ePerformance Benefits\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIncreased valve lift and duration for improved airflow\u003c\/li\u003e \u003cli\u003eStronger mid-range torque\u003c\/li\u003e \u003cli\u003eHigher top-end RPM capability\u003c\/li\u003e \u003cli\u003eFaster throttle response\u003c\/li\u003e \u003cli\u003eImproved overall horsepower\u003c\/li\u003e \u003cli\u003eIdeal for performance and big bore engine builds\u003c\/li\u003e \u003cli\u003eDirect replacement for the factory camshaft\u003c\/li\u003e \u003cli\u003eNo cylinder head machining required\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eEngine Compatibility\u003c\/h2\u003e \u003cp\u003eDesigned for most GY6 50cc four-stroke engines including:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e139QMA\u003c\/li\u003e \u003cli\u003e139QMB\u003c\/li\u003e \u003cli\u003e1P39QMB\u003c\/li\u003e \u003cli\u003e1P39QMA-2\u003c\/li\u003e \u003cli\u003eYN139QMB\u003c\/li\u003e \u003cli\u003eJJ1P39QMB\u003c\/li\u003e \u003cli\u003e139FMA-2\u003c\/li\u003e \u003cli\u003eBD1P39QMB\u003c\/li\u003e \u003cli\u003eBN139QMB\u003c\/li\u003e \u003cli\u003e147QMD\u003c\/li\u003e \u003cli\u003eMost other QMA and QMB engine variants\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eIf your engine code contains \u003cstrong\u003e\"QM\"\u003c\/strong\u003e or \u003cstrong\u003e\"FM\"\u003c\/strong\u003e, this camshaft is generally compatible.\u003c\/p\u003e \u003cp\u003eFits many scooters from:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eTaoTao\u003c\/li\u003e \u003cli\u003eIceBear\u003c\/li\u003e \u003cli\u003eWolf\u003c\/li\u003e \u003cli\u003eRoketa\u003c\/li\u003e \u003cli\u003eJonway\u003c\/li\u003e \u003cli\u003eTank\u003c\/li\u003e \u003cli\u003eSUNL\u003c\/li\u003e \u003cli\u003ePeace Sports\u003c\/li\u003e \u003cli\u003eBMS\u003c\/li\u003e \u003cli\u003eVitacci\u003c\/li\u003e \u003cli\u003eJMStar\u003c\/li\u003e \u003cli\u003eLance\u003c\/li\u003e \u003cli\u003eZnen\u003c\/li\u003e \u003cli\u003eDongfang\u003c\/li\u003e \u003cli\u003eMany other Chinese-built GY6 scooters\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eRecommended Engine Builds\u003c\/h2\u003e \u003cp\u003ePerfect for:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eStock 50cc engines seeking more performance\u003c\/li\u003e \u003cli\u003e72cc Big Bore Kits\u003c\/li\u003e \u003cli\u003e80cc Big Bore Kits\u003c\/li\u003e \u003cli\u003e100cc Performance Builds\u003c\/li\u003e \u003cli\u003ePerformance cylinder heads\u003c\/li\u003e \u003cli\u003eHigh-compression engines\u003c\/li\u003e \u003cli\u003ePorted cylinder heads\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCamshaft Profile: \u003cstrong\u003eA9 High-Lift\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eIntake Lobe Height: \u003cstrong\u003e26.50mm ±0.05mm\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eExhaust Lobe Height: \u003cstrong\u003e26.35mm ±0.05mm\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eMaterial: Hardened High-Carbon Steel Alloy\u003c\/li\u003e \u003cli\u003ePrecision CNC Machined\u003c\/li\u003e \u003cli\u003ePre-installed High-Speed Bearings\u003c\/li\u003e \u003cli\u003eISO 9001 Manufactured\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003ePremium Construction\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eHardened steel alloy resists cam lobe wear\u003c\/li\u003e \u003cli\u003ePrecision-ground lobes for accurate valve timing\u003c\/li\u003e \u003cli\u003eHeavy-duty pre-installed bearings reduce friction\u003c\/li\u003e \u003cli\u003eBuilt to withstand high-RPM performance use\u003c\/li\u003e \u003cli\u003eLong-lasting durability under demanding conditions\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eInstallation\u003c\/h2\u003e \u003cp\u003eThis camshaft is a \u003cstrong\u003edirect bolt-in replacement\u003c\/strong\u003e for the factory camshaft.\u003c\/p\u003e \u003cp\u003eNo machining is required on standard GY6 139QMB engines.\u003c\/p\u003e \u003cp\u003eFor best performance:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eReset valve lash after installation.\u003c\/li\u003e \u003cli\u003eRecommended valve clearance: \u003cul\u003e \u003cli\u003eIntake: \u003cstrong\u003e0.004 in (0.10mm)\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eExhaust: \u003cstrong\u003e0.004 in (0.10mm)\u003c\/strong\u003e\n\u003c\/li\u003e \u003c\/ul\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003ePerformance Tuning Recommendation\u003c\/h2\u003e \u003cp\u003eFor maximum horsepower gains, pair this camshaft with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e72cc–100cc Big Bore Kit\u003c\/li\u003e \u003cli\u003eHigh-flow intake manifold\u003c\/li\u003e \u003cli\u003ePerformance carburetor\u003c\/li\u003e \u003cli\u003eFree-flow exhaust system\u003c\/li\u003e \u003cli\u003ePerformance CDI\u003c\/li\u003e \u003cli\u003eUpgraded valve springs\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese supporting modifications allow the A9 camshaft to reach its full performance potential.\u003c\/p\u003e \u003ch2\u003ePackage Includes\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e1 × RDLN A9 High-Lift Performance Camshaft\u003c\/li\u003e \u003cli\u003ePre-installed High-Speed Bearings\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eAbout RDLN\u003c\/h2\u003e \u003cp\u003eRDLN is a premium manufacturer of high-performance aftermarket scooter components designed to maximize power, reliability, and durability. Every product undergoes extensive field testing to deliver an exceptional balance of performance, quality, and value. Whether you're upgrading a daily rider or building a race-inspired GY6 engine, RDLN components are engineered to perform when it matters most.\u003c\/p\u003e \u003cp\u003e \u003c\/p\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556433682744,"sku":"1100-1555","price":13.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/1100-1555_1220x1220_crop_center.webp__74040.1748708528.jpg?v=1792868874","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-1100-1555-rdln-performance-camshaft-a9-for-50cc-100cc-qmb139-engines","provider":"ChinesePartsPro","version":"1.0","type":"link"}