Description
Performance Compression Spring for 50cc 139QMB Engines
This performance compression spring is specifically designed for 50cc 139QMB engines. It plays an important role in engaging the belt and affects how the CVT transmission shifts from low to high gear. As one of the GY6 50cc scooter parts, this spring is available in three RPM options: 1k, 1.5k, and 2k, allowing you to tailor your scooter's performance to your riding style.
Functionality of Compression Springs
Compression springs are key components that provide the necessary pressure to engage the drive belt effectively. The RPM rating of the spring determines the shifting behavior of the transmission. A 1000 RPM spring will initiate a gear change at a lower speed compared to a 2000 RPM spring, which can lead to different performance characteristics during acceleration.
Specifications
- Wire Diameter: 4.0mm
- Inner Diameter: 49.0mm
- Length: 106.0mm
- Available RPMs: 1k, 1.5k, 2k
Fitment
This part is compatible with various 50cc and 80cc engines, particularly those with the following engine codes:
- 139QMA
- 139QMB
- 1P39QMB
- 1P39QMA-2
- YN139QMB
- JJ1P39QMB
- 139FMA-2
- BD1P39QMB
- BN139QMB
- 147QMD
If your engine code contains "QM" or "FM," this spring is likely a suitable match for your vehicle.
Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Parts
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