Description
Heavy Duty Crankshaft for GY6 50cc Engines
This heavy-duty crankshaft is designed for GY6 50cc engines, specifically the QMB139 and 139QMB models. Built to OEM specifications, it ensures a reliable fit and performance. As one of the critical GY6 50cc scooter parts, it features a 16-tooth oil pump drive gear and pre-pressed heavy-duty bearings for extended service life. This crankshaft is pre-assembled, making it ready for installation right out of the box.
Construction and Features
Manufactured to meet Japanese and Taiwanese standards, this crankshaft offers OEM-level durability. The pre-pressed bearings contribute to a longer lifespan, providing assurance for off-road and racing applications. The 16-tooth oil pump drive gear ensures compatibility with your engine's oil system.
Installation and Compatibility
This crankshaft is a direct replacement for standard and Big Bore builds, fitting into your engine without modifications. Before installation, confirm that your engine is compatible with a 16-tooth oil pump drive gear. This part is ideal for those looking to maintain or replace their GY6 50cc scooter parts.
Specifications
- OEM Part Number: NK100.81
- Engine Compatibility: QMB139 / 139QMB 49cc / 50cc 4-stroke horizontal
- Oil Pump Drive Gear: 16 tooth
- Includes: Pre-pressed heavy-duty bearings
- Dimensions (packaged): 11" L x 5" W x 4" H
Fitment
This crankshaft is compatible with the following engines:
- QMB139
- 139QMB
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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