GY6 50cc (139QMB) Engines Heavy Duty Crankshaft 16 Tooth
ITEM# TT-16484
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Description
Heavy-Duty Crankshaft for GY6 50cc Engines
This heavy-duty crankshaft is made for GY6 50cc engines, specifically the QMB139 and 139QMB models. It is built to OEM specifications so it fits reliably and performs as intended. Among GY6 50cc scooter parts, it stands out with a 16-tooth oil pump drive gear and pre-pressed heavy-duty bearings for a longer service life. The crankshaft comes pre-assembled, so it is ready to install straight out of the box.
Build Quality and Features
This crankshaft is manufactured to Japanese and Taiwanese standards and offers OEM-level durability. The pre-pressed bearings help it last longer, which makes it a good fit for off-road and racing use. The 16-tooth oil pump drive gear matches the engine's oil system.
Fitting and Compatibility
This crankshaft directly replaces standard and Big Bore builds and fits without any modifications. Before you install it, confirm that your engine uses a 16-tooth oil pump drive gear. It suits anyone maintaining or replacing 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
- Fits: GY6 50cc 4-stroke QMB139 / 139QMB engines with a 16-tooth oil pump drive gear
Fitment
Fits:
- GY6 50cc 4-stroke QMB139 / 139QMB engine (16-tooth oil pump drive gear)
- Standard and Big Bore builds
How to choose: Before ordering, check that your engine has a 16-tooth oil pump drive gear. It fits QMB139 / 139QMB 49cc or 50cc 4-stroke horizontal engines.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Engines & Engine Parts · Scooter Parts
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