GY6 50cc (139QMB) Compression Spring (Performance)

Performance Compression Spring for 50cc 139QMB Engines

This performance compression spring is built for 50cc 139QMB engines. It helps engage the belt and influences how the CVT transmission moves from low to high gear. Part of our GY6 50cc scooter parts range, it comes in three RPM ratings: 1k, 1.5k, and 2k, so you can match the setup to how you ride.

How Compression Springs Work

Compression springs supply the pressure needed to engage the drive belt properly. The spring's RPM rating sets how the transmission shifts. A 1000 RPM spring starts a gear change at a lower speed than a 2000 RPM spring, which changes how the scooter feels during acceleration.

Specifications

• Wire Diameter: 4.0mm
• Inner Diameter: 49.0mm
• Length: 106.0mm
• Available RPMs: 1k, 1.5k, 2k
• Fits: 139QMB-based 50cc and 80cc GY6 engines with engine codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB

Fitment

Compatible with:

• 139QMA engines (50cc and 80cc)
• 139QMB engines (50cc and 80cc)
• 1P39QMB engines (50cc and 80cc)
• 1P39QMA-2 engines (50cc and 80cc)
• YN139QMB engines (50cc and 80cc)
• JJ1P39QMB engines (50cc and 80cc)
• 139FMA-2 engines (50cc and 80cc)
• BD1P39QMB engines (50cc and 80cc)
• BN139QMB engines (50cc and 80cc)
• 147QMD engines (50cc and 80cc)
• Other QMA engines (50cc and 80cc)
• Other QMB engines (50cc and 80cc)

How to choose: Select the RPM rating based on your riding style. The 1000 RPM spring moves into a higher gear sooner, while the 2000 RPM spring keeps the lower gears engaged for longer.

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