GY6 50cc (139QMB) Countershaft
ITEM# TT-26736
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Description
Countershaft for 139QMB Engines in CSC Scooters
This countershaft reduction gear is built for CSC scooters, including the go MAX, Bella Classic, Nitro Sport, and Pug models. It is a dependable stand-in for the factory component and helps keep operation smooth. It belongs to the GY6 50cc scooter parts range and contributes meaningfully to how the drivetrain performs.
Signs It May Need Replacing
A worn or damaged countershaft can cost your scooter some power and efficiency. Strange noises or weaker acceleration are good reasons to think about swapping it out. Keeping up with routine maintenance makes it easier to ride reliably in everyday traffic.
Fitting Notes
This countershaft slots directly into the existing housing, so it works as a direct replacement for the original part on your scooter. Have the proper tools on hand and stick to the specifications to get a correct fit. It is compatible with several engine codes, which widens the range of machines it suits.
Specifications
- Number of Teeth (Large Gear): 52
- Number of Teeth (Small Gear): 15
- Overall Length: 57mm
- OEM Part Number: 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, and others
- Fits: CSC go, go MAX, Bella Classic 50, Nitro Sport 50, Pug 50, and bikes running 139QMB engines
Compatibility
Fits:
- GY6 50cc (139QMB)
- CSC go
- CSC go MAX
- CSC Bella Classic 50
- CSC Nitro Sport 50
- CSC Pug 50
- Bikes with 139QMB-based 50cc / 80cc engines (engine codes 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models; codes including QM or FM)
How to choose: Before ordering, compare the engine code printed on your engine with the codes listed above, such as 139QMB or 1P39QMB.
Location in the gearbox: part #6 on the gear box diagram for the GY6 50cc (139QMB), CSC Go; part #6 on the gear box diagram for the CSC Bella Classic 50; part #6 on the gear box diagram for the CSC Go Max.
Browse further: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Parts
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