This RDLN Adjustable Sheave Clutch Pulley gives you more power off the line and more gradual engagement gives your 139QMB transmission more power at top speed. 

Original Parts For Scooters SKU 151-276

Specifications:

• Clutch Seat Outer Diameter: 118mm
• Pulley Needle Bearing: HK172518RS
• Inner Diameter of Bearing in Rear Torque Driver Pulley: 12mm (6901RS)
• Six grooves: 3 straight for quicker takeoff, 3 bent for higher top speeds

Compatibility: This product fits 50 - 100cc 139QMB GY6 engines and those with the following codes:

139QMB-based 50cc / 80cc engines with the following engine codes:

Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.

About RDLN: 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.

This product is intended for off-road use only.

This product is not intended for use on public roads or land.

This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.

*Performance upgrades are considered racing parts and are not covered by warranty.