Rear Axle / Output Shaft for GY6 50cc (139QMB) & 133mm
ITEM# TT-26800
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Description
Rear Axle for GY6 50cc Engines
The output shaft, sometimes called the rear axle, plays a key role in GY6 50cc scooters. This item is a direct OEM-style replacement made for models that use a 139QMB engine. Its 20-spline ends engage the gears properly, so it is one of the essential GY6 50cc scooter parts for keeping the drivetrain running smoothly and dependably.
Design and Compatibility
This axle is built to suit a range of 50cc and 80cc four-stroke engine codes, 139QMB among them. The overall length is 133mm, and the center shaft has a 27mm diameter. The smooth section measures 17mm across, while the threaded section is 16mm in diameter. Before buying, check the length and dimensions of your current output shaft to confirm it will match.
When to Replace Your Output Shaft
A worn or damaged output shaft can start to disrupt gear engagement and may need swapping out. Warning signs include odd noises or trouble getting power to the wheel. Routinely inspecting your scooter's drivetrain makes it easier to spot when a new axle is needed. Choosing the correct fit matters for dependable operation.
Specifications
- Total Length: 133mm
- Splines: 20 (both ends)
- Center Shaft Diameter: 27mm
- Smooth End Diameter: 17mm
- Thread End Diameter: 16mm
- Fits: Chicago Scooter Company GY6 50cc (139QMB) gear box models: Bella Classic 50, go MAX, Nitro Sport 50
Fitment
Fits:
- GY6 50cc (139QMB) (133mm shaft)
- CSC Bella Classic 50
- CSC Go Max
- CSC Nitro Sport 50
- CSC Pug 50
How to choose: Measure your existing output shaft prior to ordering. It needs to be 133mm long and have 20 splines on both ends.
Where it goes: Refer to part #8 on the gear box diagram for the GY6 50cc (139QMB), CSC Go; part #8 on the gear box diagram for the CSC Bella Classic 50; part #8 on the gear box diagram for the CSC Go Max.
Other versions: For CSC Bella and Nitro scooters, this shaft is also listed as the Final Drive Shaft for CSC Bella, Nitro & CSC Scooters: Rear Axle, Output Shaft, Final Drive Shaft for CSC Bella, Nitro & CSC Scooters. For a longer shaft for the GY6 50cc (139QMB), see the ZNEN option: ZNEN Rear Axle Output Shaft, Final Drive Shaft - Long GY6 50cc (139QMB).
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Parts
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