{"product_id":"gy6s-1100-1250-ncy-high-performance-cam-for-139qmb-50cc-72cc-80cc-81cc-100cc-engines","title":"NCY HIGH PERFORMANCE CAM FOR 139QMB 50cc 72cc \/ 80cc 81cc \/ 100cc ENGINES","description":"\u003cstrong\u003eNCY PERFORMANCE CAMSHAFT\u003c\/strong\u003e \u003ch2\u003e\u003cstrong\u003eHIGH-LIFT PERFORMANCE CAM\u003c\/strong\u003e\u003c\/h2\u003e \u003ch3\u003e\u003cstrong\u003eFOR QMB139 \/ 139QMB 4-STROKE 50cc–100cc ENGINES\u003c\/strong\u003e\u003c\/h3\u003e \u003cp\u003eUnlock the full performance potential of your QMB139 engine with the genuine NCY High-Lift Performance Camshaft. Designed specifically for the 139QMB engine platform, this precision-engineered camshaft increases valve lift and duration, allowing your engine to breathe more efficiently at higher RPM.\u003c\/p\u003e \u003cp\u003eWhether you're building a mild 72cc street scooter or a fully built 100cc performance engine, this camshaft helps maximize horsepower, improve throttle response, and extend the engine's usable RPM range.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eThis is one of the most important upgrades when installing any 47mm, 50mm, 52mm, or 54mm big bore cylinder kit.\u003c\/strong\u003e\u003c\/p\u003e ⭐ FEATURES \u003cul\u003e \u003cli\u003eGenuine NCY Performance Product\u003c\/li\u003e \u003cli\u003eHigh-Lift Performance Camshaft\u003c\/li\u003e \u003cli\u003eOptimized Valve Timing\u003c\/li\u003e \u003cli\u003eIncreased Valve Lift \u0026amp; Duration\u003c\/li\u003e \u003cli\u003eImproves Cylinder Filling\u003c\/li\u003e \u003cli\u003eStronger Mid-Range Power\u003c\/li\u003e \u003cli\u003eHigher RPM Capability\u003c\/li\u003e \u003cli\u003eIncreased Top Speed Potential\u003c\/li\u003e \u003cli\u003eBetter Throttle Response\u003c\/li\u003e \u003cli\u003ePlug-and-Play Installation\u003c\/li\u003e \u003cli\u003eNo Cylinder Head Machining Required\u003c\/li\u003e \u003cli\u003ePrecision Ground Cam Lobes\u003c\/li\u003e \u003cli\u003eHardened Steel Construction\u003c\/li\u003e \u003cli\u003eFactory-Indexed 34-Tooth Timing Gear\u003c\/li\u003e \u003cli\u003eMade for Street \u0026amp; Performance Builds\u003c\/li\u003e \u003c\/ul\u003e WHY UPGRADE YOUR CAMSHAFT? \u003cp\u003eA stock camshaft limits how much air and fuel can enter the engine. As displacement increases with a big bore kit, the factory cam becomes a restriction.\u003c\/p\u003e \u003cp\u003eThe NCY Performance Camshaft opens the valves farther and keeps them open longer, allowing your engine to take full advantage of the larger cylinder.\u003c\/p\u003e \u003cp\u003eBenefits include:\u003c\/p\u003e \u003cp\u003e✔ Stronger Acceleration\u003c\/p\u003e \u003cp\u003e✔ Increased Horsepower\u003c\/p\u003e \u003cp\u003e✔ Higher RPM Range\u003c\/p\u003e \u003cp\u003e✔ Improved Top-End Speed\u003c\/p\u003e \u003cp\u003e✔ Better Airflow\u003c\/p\u003e \u003cp\u003e✔ More Efficient Combustion\u003c\/p\u003e \u003cp\u003e✔ Better Performance From Big Bore Kits\u003c\/p\u003e PERFECT FOR \u003cul\u003e \u003cli\u003eStock 50cc Performance Builds\u003c\/li\u003e \u003cli\u003e47mm (Approx. 72cc \/ Commonly Sold as 80cc)\u003c\/li\u003e \u003cli\u003e50mm (Approx. 81cc \/ Commonly Sold as 100cc)\u003c\/li\u003e \u003cli\u003e52mm Big Bore Builds\u003c\/li\u003e \u003cli\u003e54mm Big Bore Builds\u003c\/li\u003e \u003cli\u003eDaily Riders\u003c\/li\u003e \u003cli\u003ePerformance Scooters\u003c\/li\u003e \u003cli\u003eRacing Applications\u003c\/li\u003e \u003c\/ul\u003e SPECIFICATIONS \u003ch3\u003eBrand\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eNCY\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eProduct Type\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eHigh-Lift Performance Camshaft\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eEngine Type\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eQMB139 \/ 139QMB\u003c\/li\u003e \u003cli\u003eAir-Cooled\u003c\/li\u003e \u003cli\u003eSingle Cylinder\u003c\/li\u003e \u003cli\u003e4-Stroke\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eIntake Lobe\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e25.8mm × 21mm × 10.3mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eExhaust Lobe\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e25.5mm × 21mm × 10.2mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eTiming Sprocket\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e34 Teeth\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eCam Bearings\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e(2) TPI #16002C3\u003c\/li\u003e \u003cli\u003eBearing Size: 18 × 32 × 8mm\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eConstruction\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eHardened Heat-Treated Steel\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eSKU\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e1100-1250\u003c\/li\u003e \u003c\/ul\u003e PERFORMANCE BENEFITS \u003cp\u003e✔ Better Valve Lift\u003c\/p\u003e \u003cp\u003e✔ Increased Valve Duration\u003c\/p\u003e \u003cp\u003e✔ Improved Airflow\u003c\/p\u003e \u003cp\u003e✔ More Mid-Range Torque\u003c\/p\u003e \u003cp\u003e✔ Stronger Top-End Power\u003c\/p\u003e \u003cp\u003e✔ Faster Engine Response\u003c\/p\u003e \u003cp\u003e✔ Higher RPM Capability\u003c\/p\u003e \u003cp\u003e✔ Precision Ground Lobes\u003c\/p\u003e \u003cp\u003e✔ Excellent Reliability\u003c\/p\u003e FITMENT \u003cp\u003eFits QMB139 \/ 139QMB engines including:\u003c\/p\u003e \u003cp\u003eEngine Codes\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\u003eJJ139QMB\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 QMB139 Variants\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eCommon Scooter Brands\u003c\/p\u003e \u003cul\u003e \u003cli\u003eTaoTao\u003c\/li\u003e \u003cli\u003eWolf\u003c\/li\u003e \u003cli\u003eIce Bear\u003c\/li\u003e \u003cli\u003eRoketa\u003c\/li\u003e \u003cli\u003eJonway\u003c\/li\u003e \u003cli\u003eTank\u003c\/li\u003e \u003cli\u003ePeace Sports\u003c\/li\u003e \u003cli\u003eBMS\u003c\/li\u003e \u003cli\u003eZnen\u003c\/li\u003e \u003cli\u003eBintelli\u003c\/li\u003e \u003cli\u003eChicago Scooter Company\u003c\/li\u003e \u003cli\u003eSSR Motorsports\u003c\/li\u003e \u003cli\u003eDongfang\u003c\/li\u003e \u003cli\u003eJMStar\u003c\/li\u003e \u003cli\u003eSUNL\u003c\/li\u003e \u003cli\u003eGator\u003c\/li\u003e \u003cli\u003eBaja\u003c\/li\u003e \u003cli\u003eRedcat\u003c\/li\u003e \u003cli\u003eKazuma\u003c\/li\u003e \u003cli\u003eMany Other Chinese Scooters Equipped with QMB139 Engines\u003c\/li\u003e \u003c\/ul\u003e RECOMMENDED PERFORMANCE COMBINATIONS \u003cp\u003eFor the best results, pair this camshaft with:\u003c\/p\u003e \u003cp\u003e✔ 47mm Big Bore Kit (Approx. 72cc)\u003c\/p\u003e \u003cp\u003e✔ 50mm Big Bore Kit (Approx. 81cc)\u003c\/p\u003e \u003cp\u003e✔ 52mm Big Bore Kit\u003c\/p\u003e \u003cp\u003e✔ 54mm Big Bore Kit\u003c\/p\u003e \u003cp\u003e✔ Performance CDI\u003c\/p\u003e \u003cp\u003e✔ High Output Ignition Coil\u003c\/p\u003e \u003cp\u003e✔ Larger Main Jet\u003c\/p\u003e \u003cp\u003e✔ Performance Carburetor\u003c\/p\u003e \u003cp\u003e✔ Performance Exhaust\u003c\/p\u003e \u003cp\u003e✔ Lightweight Roller Weights\u003c\/p\u003e \u003cp\u003e✔ Performance CVT\u003c\/p\u003e IMPORTANT INSTALLATION INFORMATION \u003cp\u003e⚠ \u003cstrong\u003eProfessional installation is recommended.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eAfter installation:\u003c\/p\u003e \u003cul\u003e \u003cli\u003eVerify valve-to-piston clearance by rotating the crankshaft by hand before starting the engine.\u003c\/li\u003e \u003cli\u003eAdjust valve lash before initial startup.\u003c\/li\u003e \u003cli\u003eVerify proper cam timing.\u003c\/li\u003e \u003cli\u003eLubricate camshaft journals and lobes with assembly lube.\u003c\/li\u003e \u003cli\u003eChange engine oil after break-in.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eFailure to verify proper valve clearance and cam timing can result in severe engine damage.\u003c\/p\u003e RECOMMENDED VALVE LASH \u003cp\u003eFor most modified QMB139 engines:\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIntake:\u003c\/strong\u003e 0.003\"–0.004\"\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eExhaust:\u003c\/strong\u003e 0.003\"–0.004\"\u003c\/p\u003e \u003cp\u003eAlways verify the recommended clearance for your specific engine combination.\u003c\/p\u003e WHY CHOOSE NCY? \u003cp\u003eNCY is one of Taiwan's most respected manufacturers of high-performance scooter components. Their products are engineered for precision, durability, and reliable performance, making them a trusted choice for enthusiasts and professional builders worldwide.\u003c\/p\u003e BUILD YOUR ULTIMATE QMB139 ENGINE \u003cp\u003eFor maximum performance, combine this camshaft with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e54mm Big Bore Cylinder\u003c\/li\u003e \u003cli\u003e44mm Stroker Crankshaft\u003c\/li\u003e \u003cli\u003ePerformance Cylinder Head\u003c\/li\u003e \u003cli\u003e19–21mm Carburetor\u003c\/li\u003e \u003cli\u003eHigh-Flow Intake\u003c\/li\u003e \u003cli\u003ePerformance Exhaust\u003c\/li\u003e \u003cli\u003eUpgraded CVT Components\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eTogether, these upgrades allow your engine to breathe efficiently, produce more horsepower, and deliver significantly stronger acceleration and top-end performance.\u003c\/p\u003e \u003ch3\u003e\u003cstrong\u003eQUALITY PARTS • FAST SHIPPING • EXPERT SUPPORT\u003c\/strong\u003e\u003c\/h3\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556446429496,"sku":"1100-1250","price":48.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/1100-1250__32579.1626124695.jpg?v=1792869207","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-1100-1250-ncy-high-performance-cam-for-139qmb-50cc-72cc-80cc-81cc-100cc-engines","provider":"ChinesePartsPro","version":"1.0","type":"link"}