Hoca QMB139 Stroker Crankshaft, Part #169-239
Hoca 44mm Stroker Crankshaft Assembly for 50cc 4-stroke QMB139 engines. 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. Connecting Rod Inner Diameter: 13mm. Number of Teeth (oil pump drive gear): 16.