{"product_id":"rdln-performance-camshaft-a9-qmb139-1100-1555","title":"RDLN A9 Performance Camshaft – GY6 50cc \/ 139QMB (High-Lift)","description":"\u003ch2\u003eStage 2 Power: RDLN A9 High-Lift Performance Camshaft\u003c\/h2\u003e\u003cp\u003eTransform your scooter's power band with the \u003cstrong\u003eRDLN A9 Performance Camshaft\u003c\/strong\u003e. Designed specifically for the GY6 50cc (139QMB) platform, the A9 profile is the industry standard for increased performance. By increasing valve lift and extending duration, this camshaft allows your engine to breathe deeper at high RPMs, delivering a significant boost in mid-range torque and top-end speed.\u003c\/p\u003e\u003ch3\u003eThe RDLN Engineering Edge\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Valve Timing:\u003c\/strong\u003e The A9 profile is engineered to provide a more aggressive lift than stock, ensuring maximum air\/fuel intake for engines equipped with 72cc to 100cc Big Bore Kits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Bearing Assembly:\u003c\/strong\u003e Pre-fitted with high-speed, low-friction steel bearings to ensure smooth rotation and long-term reliability under high-heat racing conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged Steel Alloy:\u003c\/strong\u003e CNC-machined from high-carbon steel alloy, preventing lobe wear and \"pitting\" over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-In Installation:\u003c\/strong\u003e Designed as a direct replacement for the stock camshaft; no machining of the head or valve train is required for standard 139QMB applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFitment Guide\u003c\/h3\u003e\u003cp\u003eThis camshaft is compatible with \u003cstrong\u003e139QMA \/ 139QMB\u003c\/strong\u003e engine heads found on nearly all 4-stroke 50cc Chinese scooters:\u003c\/p\u003e\u003ctable style=\"width: 87.0908%; height: 78.3751px;\" height=\"100\" width=\"463\"\u003e\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003e139QMA\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003e139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003e1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003e1P39QMA-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003eYN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003eJJ1P39QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003e139FMA-2\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 19.5938px;\"\u003eBD1P39QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 24.6905%; height: 39.1875px;\"\u003eBN139QMB\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 39.1875px;\"\u003e147QMD\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 39.1875px;\"\u003eOther QMA models\u003c\/td\u003e\n\u003ctd style=\"width: 24.6905%; height: 39.1875px;\"\u003eOther QMB models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDon't see your engine listed? If the engine code includes \"QM\" or \"FM\", this product is compatible with your vehicle.\u003c\/span\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Lobe:\u003c\/strong\u003e 26.50mm ( ±0.05)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Lobe:\u003c\/strong\u003e 26.35mm ( ±0.05)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Hardened Steel Alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e ISO 9001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Complete Camshaft with pre-installed bearings\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eTuning Tip:\u003c\/strong\u003e To fully realize the gains of the A9 camshaft, we recommend pairing it with a \u003ca href=\"#\"\u003eHigh-Flow Intake Manifold\u003c\/a\u003e and slightly stiffer \u003ca href=\"#\"\u003eValve Springs\u003c\/a\u003e. Always re-adjust your valve lash to \u003cstrong\u003e.004\" (0.10mm)\u003c\/strong\u003e for both Intake and Exhaust after installation.\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/blockquote\u003e\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eAbout RDLN:\u003c\/strong\u003e RDLN is a premier line of aftermarket performance upgrade systems and components for scooters. RDLN products are engineered to significantly improve the function, performance, and reliability of your vehicle with the ultimate goal being an optimal balance of price, power, and performance. RDLN’s extensive field-testing network ensures each product exceeds customer requirements and expectations every time. RDLN delivers full-throttle performance at uncompromised quality.\u003c\/p\u003e\u003ch4 style=\"color: #983d3c;\"\u003eThis product is intended for off-road use only.\u003c\/h4\u003e\u003ch4 style=\"color: #983d3c;\"\u003eThis product is not intended for use on public roads or land.\u003c\/h4\u003e\u003ch4 style=\"color: #983d3c;\"\u003eThis product is not legal for use in Californ\u003c\/h4\u003e","brand":"RDLN","offers":[{"title":"Default Title","offer_id":49244788293912,"sku":"1100-1555","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/1100-1555.webp?v=1747854776","url":"https:\/\/www.scooterworks.com\/products\/rdln-performance-camshaft-a9-qmb139-1100-1555","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}