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22T Crankshaft Assembly for GY6 50cc 60cc 80cc 139QMB
22T Crankshaft Assembly for GY6 50cc 60cc 80cc 139QMB
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Product Overview
Replace a worn or damaged crankshaft with this 22T crankshaft assembly, designed for compatible GY6 139QMB / 139QMA 4-stroke engines.
Suitable for selected 50cc, 60cc, and 80cc scooter, ATV, and quad applications using the matching 22-tooth oil-pump drive gear.
The crankshaft transfers piston movement into rotational power while supporting normal engine operation. For accurate fitment, compare the engine code, oil-pump gear tooth count, and original crankshaft design before ordering.
Product Compatibility
| Engine / Application | Fitment Notes |
|---|---|
| GY6 139QMB | Compatible 22T crankshaft applications |
| GY6 139QMA | Verify original crankshaft configuration |
| 50cc 4-Stroke | Common 139QMB/QMA application |
| 60cc 4-Stroke | Selected GY6 / big-bore applications |
| 80cc 4-Stroke | Selected GY6 / big-bore applications |
| Scooter | Verify 139QMB/QMA engine code |
| ATV / Quad | Compatible GY6-based applications only |
Specifications
| Specification | Details |
| Product Type | Crankshaft Assembly |
| Engine Type | GY6 139QMB / 139QMA |
| Engine Cycle | 4-Stroke |
| Oil Pump Drive Gear | 22 Teeth |
| Compatible Displacement | Selected 50cc / 60cc / 80cc |
| Application | Scooter / ATV / Quad |
| Condition | New |
| Package Quantity | 1 Assembly |
Key Features
- 22T Oil-Pump Drive Gear: Designed for GY6 engines using the 22-tooth crankshaft version.
- 139QMB/QMA Application: Suitable for compatible small-displacement 4-stroke GY6 engines.
- 50cc–80cc Applications: Supports selected standard and big-bore GY6 configurations.
- Crankshaft Replacement: Practical replacement for a worn, damaged, or failed original crankshaft.
- Dimension-Based Fitment: Compare the original crankshaft and gear configuration before installation.
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Fitment FAQ
Will this part fit my specific model and year?
This crankshaft is designed for selected GY6 139QMB / 139QMA 4-stroke engines, including compatible 50cc, 60cc, and 80cc applications.
Vehicle model or displacement alone does not guarantee fitment. Check the engine code and original crankshaft configuration.
Do I need to match the OEM part number?
No specific OEM number is provided.
The most important checks are:
GY6 139QMB / 139QMA engine
22-tooth oil-pump drive gear
Original crankshaft shape and dimensions
Bearing and shaft configuration
What models or situations does this part not fit?
This crankshaft is not suitable for:
139QMB/QMA engines requiring a 16T crankshaft
GY6 125cc / 150cc engines
2-stroke engines
Engines with a different crankshaft design
Applications with incompatible bearings, shaft ends, or oil-pump gears
What should I check before ordering?
Confirm:
Engine code is 139QMB or 139QMA
Engine is 4-stroke
Original crankshaft has a 22T oil-pump drive gear
Crankshaft shape matches the product photos
Bearing locations and shaft ends match
Connecting-rod configuration matches