{"product_id":"cam-performance-gy6-50-cc-qmb139-ncy-brand","title":"NCY Performance Camshaft 139QMB GY6 50cc","description":"\u003cp\u003eUnlock the hidden power potential of your 4-stroke scooter with the \u003cstrong\u003eNCY Performance Camshaft\u003c\/strong\u003e (1100-1250). Designed specifically for the GY6 139QMB engine platform, this high-lift cam profile increases valve duration and lift, allowing your engine to breathe deeper and rev higher. This is the essential upgrade whenever you install a 72cc, 82cc, or 100cc big-bore cylinder kit to ensure your engine can fully utilize the increased displacement.\u003c\/p\u003e\u003cp\u003eThis product is intended for off-road use only. This product is not intended for use on public roads or land.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Lobe Geometry:\u003c\/strong\u003e Increased lift and duration profiles significantly improve volumetric efficiency compared to stock cams.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-Machined Sprocket:\u003c\/strong\u003e Includes a factory-indexed 34-tooth timing sprocket for precise valve-to-piston synchronization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardened Steel Core:\u003c\/strong\u003e Wear-resistant steel withstands sustained high-RPM heat and stress of modified performance builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug-and-Play Fitment:\u003c\/strong\u003e Drop-in installation into stock 139QMB cylinder heads — no machining required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake Lobe:\u003c\/strong\u003e 25.8mm × 21mm × 10.3mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Lobe:\u003c\/strong\u003e 25.5mm × 21mm × 10.2mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSprocket Teeth:\u003c\/strong\u003e 34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e 2 × TPI #16002C3 (18×32×8mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 1100-1250\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e When installing a high-performance camshaft with a big-bore kit, verify valve-to-piston clearance by rotating the crankshaft by hand before startup. Set valve lash to performance spec (typically 0.003–0.004\" intake\/exhaust on modified engines) upon installation.\u003c\/p\u003e\u003ch2\u003eModel Fitment\u003c\/h2\u003e\u003cp\u003eDirect fit for 139QMB-based 50cc, 72cc, 82cc, and 100cc 4-stroke engines with the following factory engine codes:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eEngine Series Code\u003c\/th\u003e\n\u003cth\u003eCompatible Variants\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommon Codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ139QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":67964558672193,"sku":"1100-1250","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1011\/7785\/2225\/files\/az-p012-6808-0-1100-1250_1d7d662d-80fe-4749-b173-b03d5c034eb9.jpg?v=1792557843","url":"https:\/\/azscooterparts.com\/products\/cam-performance-gy6-50-cc-qmb139-ncy-brand","provider":"AZScooterParts","version":"1.0","type":"link"}