SIP crankcase for Vespa 50-125 ET3 PK50-125 24303000

Smallframes are among the most popular Vespa models. Because they are slow by nature, they are often tuned. The basis of every tuning is the engine case and, like many other components, smallframe crankcases and complete engines have become rare and expensive. For this reason we have decided to produce a new and revised SIP smallframe crankcase

The basis for this is a PK case. All internal components are taken from the PK models and intended for them in terms of species. The transfer ports match the originals, but have been enlarged on the front and rear of the case and the case has been strengthened. All options offer more material and additional reinforcing ribs / braces, along with increased stability. The cylinder sealing surface is extended on both case halves for maximum sealing surface size with revised transfer ports / cylinders. The intake has clearly more material at all levels and the 3 hole fixing.

The flywheel side has changed cable guide and additional reinforcements and the lower case screw connection has been externally compensated for crankshafts with a larger crank diameter/stroke. The intake valve rotation time corresponds to the PK125 ETS and also works very well on 50cc cylinders. The rotary valve sealing surface is larger and therefore offers the possibility of extending/changing the intake timing. The gear axis (arm) is positioned in a bushing that can be exchanged. The primary bearing unit has a 57.5mm seat to be able to use all primary repair kit transmissions. Internally, the crankcase also has additional reinforcement ribs/braces for increased stability and the swingarm has been designed for the use of 3.00 and 3.50x10.

Bottom line: Your smallframe is no longer at risk of dying from engine damage. And at a great price/performance ratio!