This OEM replacement crankshaft assembly fits 139QMB engines with 16 tooth oil pump drives. Main bearings are installed.
Original Parts For Scooters SKU 151-19
Specifications:
Stroke: 41.4mm
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
Number of Teeth (oil pump drive gear): 16
139QMB-based 50cc / 80cc engines with the following engine codes:
139QMA
139QMB
1P39QMB
1P39QMA-2
YN139QMB
JJ1P39QMB
139FMA-2
BD1P39QMB
BN139QMB
147QMD
Other QMA models
Other QMB models
Don’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.
About Scooterworks: Since our beginning in 1989, Scooterworks has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.
