GY6 50cc (139QMB)/Piaggio Performance Torque Spring Base

Performance Torque Spring Base for GY6 50cc and Piaggio Engines

The Performance Torque Spring Base is a useful part for getting more out of a GY6 50cc or Piaggio scooter. It takes the place of the factory spring seat and uses a ball-bearing assembly to provide smooth, steady shifting. It is built for the 139QMB engine platform and is one of the GY6 50cc scooter parts that can noticeably sharpen acceleration and downshifting.

Ball-Bearing Design for Better Response

This upgrade uses an anti-binding ball-bearing setup that lets the torque spring turn freely, which cuts down on friction and mechanical strain. Because the spring no longer binds, the rear pulley reacts more quickly to throttle input, helping the engine stay in its most effective power range during both acceleration and deceleration.

Low-Profile Build for Easy Fitting

At an overall height of only 30mm, the torque spring base works with both stock and aftermarket torque springs. Its slim profile means the clutch bell does not need any changes, so it is a simple addition to your scooter's CVT system.

Specifications

• OEM Part Number: NK900.44
• Size: 30mm height
• Includes: Spring base, ball bearings, hardened bearing race
• Requirement: Must be paired with High-Temp Bearing Grease
• Fits: GY6 50cc (139QMB) engines, plus Piaggio 50cc, Euro 2-stroke and some Honda 50cc scooters

Fitment

Fits:

• GY6 50cc (139QMB) engine (TaoTao, Wolf, Kymco, SYM, Lance, Bintelli)
• Piaggio 50cc (Vespa ET2 50, Piaggio Typhoon 50)
• Euro 2-stroke (Aprilia SR50, Derbi Bullet, Gilera Runner)
• Honda Ruckus (Zoomer), Honda Metro (CHF50)

How to choose: Pick the base that matches your transmission's torque spring seat. The 30mm figure is the overall height of this base.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Parts