NCY Performance Camshaft 139QMB GY6 50cc

Unlock the hidden power potential of your 4-stroke scooter with the NCY Performance Camshaft (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.

This product is intended for off-road use only. This product is not intended for use on public roads or land.

Key Features

• Optimized Lobe Geometry: Increased lift and duration profiles significantly improve volumetric efficiency compared to stock cams.
• Precision-Machined Sprocket: Includes a factory-indexed 34-tooth timing sprocket for precise valve-to-piston synchronization.
• Hardened Steel Core: Wear-resistant steel withstands sustained high-RPM heat and stress of modified performance builds.
• Plug-and-Play Fitment: Drop-in installation into stock 139QMB cylinder heads — no machining required.

Technical Specifications

• Intake Lobe: 25.8mm × 21mm × 10.3mm
• Exhaust Lobe: 25.5mm × 21mm × 10.2mm
• Sprocket Teeth: 34
• Bearings: 2 × TPI #16002C3 (18×32×8mm)
• SKU: 1100-1250

Installation Note: 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.

Compatibility

Direct fit for 139QMB-based 50cc, 72cc, 82cc, and 100cc 4-stroke engines with the following factory engine codes:

Fits 139QMB-based GY6 50cc/72cc/82cc/100cc 4-stroke engines: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ139QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, and other QMB/QMA/FM engine code variants. Used across most Chinese-brand 50cc scooters (TaoTao, Wolf, Bintelli, Peace, Ice Bear, ZNEN, and others) specifying the 139QMB engine.