Transform your scooter's power band with the RDLN A9 High-Lift Performance Camshaft. 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. Ideal for engines equipped with 72cc�100cc big bore kits.
Compatible with 139QMA / 139QMB engine heads found on nearly all 4-stroke 50cc Chinese scooters:
Don't see your engine code? If your 49/50cc 4-Stroke engine code includes "QM" or "FM", this camshaft is likely compatible.
Tuning Tip: To fully realize the gains of the A9 camshaft, pair it with a high-flow intake manifold and slightly stiffer valve springs. Always re-adjust valve lash to .004" (0.10mm) for both intake and exhaust after installation.
Off-Road Use Only: This product is intended for off-road/racing use only. Not legal for use on public roads or on pollution-controlled vehicles in California. Performance upgrades are not covered under warranty.
California Prop 65 Warning: www.p65warnings.ca.gov
