Ensure smooth, reliable acceleration with this Torque Drive Assembly for QMB139 50cc GY6 Engines. Commonly referred to as the CVT rear pulley, this component plays a critical role in the shifting operation of your scooter’s continuously variable transmission (CVT). It maintains proper belt tension and controls gear ratio changes under varying load conditions. Perfect for routine maintenance or a full transmission rebuild, this torque driver is compatible with most 49cc/50cc 4-stroke Chinese scooters using the QMB139 engine platform.
- Direct replacement torque drive assembly for QMB139 50cc engines Precision-machined for optimal belt tracking and consistent shifting Improves CVT performance, acceleration, and throttle response High-quality aluminum and steel construction for long service life Easy installation – OEM fit for most Chinese scooters Specifications: Engine Type: QMB139 (GY6 50cc 4-stroke) Part Type: Rear pulley / torque driver assembly Material: Cast aluminum pulley with hardened steel components Condition: Brand New
