Crankshaft Doppler S1 Replica Yamaha BW’s \/ Slider

Doppler Crankshaft S1 Replica MBK Booster \/ Stunt for 10mm piston pin.Full-circle crankshaft for higher primary compression with reinforced connecting rod for 10mm piston pin; a small end bearing is included. Ideally suited and recommended for use with 50cc and 70cc sports cylinders.

We recommend using matching reinforced main bearings with this crankshaft (sold separately).