GY6 50cc (139QMB) Right Crankcase

Right Crankcase for 139QMB 50cc and 80cc Engines

This right-side crankcase is built to take the place of the original part on 139QMB scooters and motorcycles. It plays an important role in keeping the engine running properly. Listed among our GY6 50cc scooter parts, it routes oil correctly through a 33-tooth oil pump, which is not included. It works with a range of engine codes, so it suits many different riders.

Role and Why It Matters

The crankcase forms the housing for several internal components that help the bike operate. It keeps dirt and debris away from the moving parts while allowing oil to move through the engine as intended. If your engine is losing performance, swapping in a new crankcase may fix the problem.

Fitting Guidance

This crankcase is made to match engines based on the 139QMB design. Installing it correctly is essential for getting your engine back to working well and for long service life. Confirm that it matches your engine code before ordering.

Specifications

• Position: Right Side
• Fits: GY6 139QMB-based 50cc and 80cc engines (engine codes 139QMA, 139QMB, 1P39QMB, 147QMD and others)

Compatibility

Compatible with:

• GY6 139QMB-based 50cc and 80cc engines (139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD)
• Other QMA engines
• Other QMB engines

How to choose: When your engine code contains "QM" or "FM", this part will work with your engine.

Browse further: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Engines & Engine Parts · Scooter Parts