SIP PERFORMANCE Uncle Tom bell-shaped 54mm stroke, 105mm 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 20mm oil seal and a large cone type ignition is required with these crankshafts.
Rod length: 105mm
Made in Italy.
As soon as we get new stock for SIP Performance Crankshaft 54mm- Vespa 90-125/ PK80-125, we'll send you an email.