GY6 50cc (139QMB) Final Drive Gear
ITEM# TT-26725
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Description
Final Drive Gear for CSC Scooters and 139QMB Engines
This final drive gear suits CSC scooters, including the go and go MAX models along with the Pug50, plus any bikes that use 139QMB engines. It carries engine power to the wheels so the scooter keeps running dependably. It is one of the useful GY6 50cc scooter parts for keeping your scooter in good working order.
19-Spline Design
The gear uses 19 splines, which lock firmly onto matching components. That tight engagement lets power pass through efficiently and keeps operation smooth. If acceleration or overall performance starts to fall off, this is a part worth inspecting and replacing.
Compatibility and Fitment
This part works with several engine models, so it installs without fuss on suitable scooters. Before buying, confirm that your engine code includes "QM" or "FM."
Specifications
- Number of Splines: 19
- Inner Diameter (spline peak to peak): 18mm
- Thickness: 15.7mm
- Fits: Chicago Scooter Company go, go MAX and Pug50, and 139QMB-based 50cc/80cc engines
Fitment
Fits:
- Chicago Scooter Company go
- Chicago Scooter Company go MAX
- Chicago Scooter Company Pug50
- GY6 50cc (139QMB) engines with codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models
How to choose: Look for a spline count of 19, an 18mm inner diameter, and a 15.7mm thickness, and make sure the engine code includes QM or FM.
Where it goes: part #9 on the gear box diagram for the GY6 50cc (139QMB), CSC Go; part #9 on the gear box diagram for the CSC Go Max; part #9 on the gear box diagram for the CSC Pug 50.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Transmission & Final Drive · Scooter Parts
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