MYK crankshaft Assembly for GY6/QMB139 50cc to 80cc 4 stroke engines.

- Oil pump drive gear 22 teeth.
- Inexpensive replacement for OEM crankshaft.
- Fits 50cc/80cc 4 Stroke GY6/QMB139 Engines.
- Stroke: 41.4mm
- Overall Length: 246mm
- 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

Peace, Iceberg, Roketa, Baja, Baccio and many more Chinese scooters with 50cc 4 stroke engines.

MYK Crankshaft Assembly for GY6/QMB139 50cc to 80cc 4 stroke engines. Type 2 ( 22 Teeth @ the oil pu