Description
GY6 50cc Stroker Crankshaft for QMB139 Engines
The 44mm Stroker Crankshaft Assembly is designed specifically for 50cc 4-stroke QMB139 engines, making it a reliable component for scooter enthusiasts. This crankshaft is engineered to improve performance and is ideal for those looking to replace worn parts within their engine. It is one of the GY6 50cc scooter parts that can significantly affect engine output and efficiency. Designed for straightforward installation, this crankshaft is a key part for maintaining proper engine function.
Construction and Specifications
This crankshaft assembly features precise engineering to ensure compatibility and performance. With an overall length of 247mm, it is built to fit comfortably within the engine. The tapered side has a thread size of M10x1.25, while the spline side is M12x1.25. The bearings have outer diameters of 42mm on the tapered side and 47mm on the spline side, facilitating smooth operation.
When to Consider Replacement
Replacing the crankshaft may be necessary when experiencing decreased engine performance or unusual vibrations during operation. If you're noticing issues with the oil pump drive gear, which has 16 teeth and is compatible with a 33t oil pump, it could also indicate the need for a new crankshaft. Regular maintenance checks can help identify when it's time for a replacement.
Specifications
- Size: 44mm Stroker
- Overall Length: 247mm
- Thread Size (Tapered Side): M10x1.25
- Thread Size (Spline Side): M12x1.25
- Bearing Outer Diameter (Tapered Side): 42mm
- Bearing Outer Diameter (Spline Side): 47mm
- Number of Splines: 26
- Connecting Rod Inner Diameter: 13mm
- Number of Teeth (Oil Pump Drive Gear): 16
Fitment
This crankshaft is compatible with QMB139 50cc/49cc engines.
- GY6 50cc scooters
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 Engines & Engine Parts · Scooter Parts
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