SIP PERFORMANCE Uncle Tom bell-shaped 56mm stroke, 110mm conrod crankshaft for Vespa Smallframe 90-125cc, PK80-125cc. Also 50cc engines with 125cc cylinders. For reed valve engines!

High end racing crankshaft. These crankshafts are a reproduction of the famous crankshafts once produced by Thomas Dolischka. These are the peak in performance crankshafts, second to none. The bell shape is optimised for reed valves. The forged conrod has been polished to reduce turbulence in the crank casings.

Smallframe engine casings will need the crankcases machined at the cylinder base to accept the larger conrod. These are ideally suited for SIP EVO engine casings.

A large cone ignition is required with these crankshafts.

Specs:
Stroke: 56mm
Rod length: 110mm
Cone: 20/20mm

Made in Italy.

SIP 45029200