Naraku Heavy Duty Crankshaft 16 Tooth | 139QMB Engines Yamaha-Zuma-50 Stud Spacing: 50mm

Stud Spacing: 50mm

This mirror set is a direct replacement for the following models:

The Big Block gets its name from the tread pattern

Size: 200mm

Naraku Heavy Duty Crankshaft 16 Tooth | 139QMB Engines Yamaha-Zuma-50 Stud Spacing: 50mmThe Naraku Heavy Duty Crankshaft is a premium OEM quality replacement for 50cc 4 stroke QMB139 engines. Built to Japanese and Taiwanese OEM standards, it features heavy duty pre pressed bearings for extended service life and durability a significant step up from low cost Chinese alternatives. Matches the original crank dimensions for a direct drop in fit, and works equally well as a standard replacement or as the foundation for a Big Bore build.