GY6 50cc (139QMB) Performance Clutch Torque Springs

Performance Clutch Torque Springs for GY6 50cc Scooters

These performance clutch torque springs are made for GY6 50cc scooters and are matched to the QMB139 engine. They let you fine-tune the continuously variable transmission (CVT) so the scooter responds in a way that suits how you ride and what modifications you have. They are one of the GY6 50cc scooter parts that can noticeably affect acceleration and throttle response, which makes them a practical upgrade for both stock and modified machines.

Engagement Options

The springs are offered in three RPM engagement ratings: 1000, 1500, and 2000 RPM. The 1000 RPM set engages earliest, which suits maximizing low-speed pull and easy stop-and-go travel around town. The 1500 RPM set is a middle choice that works well for everyday street use. The 2000 RPM set engages later, so it is better suited to riders running performance builds or larger bore kits who want a stronger high-end power band and better top-speed behavior.

Compatibility and Installation

These springs have a 49mm inner diameter and are designed to work with QMB139 clutch assemblies, so they fit cleanly with compatible clutch bells. They can be used with a range of OEM and aftermarket clutch setups, giving you flexibility when tuning your scooter.

Specifications

• Inner Diameter: 49mm
• Available RPM Options: 1000, 1500, 2000
• Engine Compatibility: QMB139 50cc/49cc 4-stroke
• Fits: QMB139 50cc/49cc 4-stroke engines and scooters using the 139QMB platform

Fitment

Fits:

• QMB139 50cc/49cc 4-stroke scooters
• TaoTao, Roketa, Jonway, Wolf, Ice Bear, Vitacci, Peace Sports and other makes/models using the 139QMB engine platform

How to choose: Pick 1000 RPM for stock or lightly modified engines and stop-and-go riding, 1500 RPM for general street riding, or 2000 RPM for performance builds and big bore kits.

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