Crankshaft -POLINI (rotary valve)- Vespa V50, PK50 S (Ø=19mm cone)

Very high quality Polini tuning crankshaft. Solid CNC connecting rod, top and bottom slotted. Extended intake angle to increase the time cross section of the intake and increase the power over the whole rev band. Condition when using larger cylinders/carburettors. But also brings already a noticeable effect on original cylinders.

Well balanced, the Polini shaft offers a clean concentricity.

Technical data:

• cone: small type (Ø19mm shaft seal)

• stroke: 43mm

• piston pin: 12mm

Suitable for:

• Vespa V50, 50N, 50 Special, PK50 S