Crankshaft -POLINI (rotary valve) 51mm stroke, 97mm conrod- conversion Vespa PK50 XL/XL2 to 125cc (Ø=20mm 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: large type (Ø20mm shaft seal)

• stroke: 51mm

• piston pin: 15mm

Suitable for:

• as conversion shaft from 50ccm to 125ccm and larger: Vespa PK50 XL/XL2 (polewheel/ignition can be retained)

• as conversion shaft from 50ccm to 125ccm and larger, if at the same time the ignition/polewheel is converted to the Ø20mm type (also for conversion to electronic ignition): Vespa V50, 50N, 50 Special, PK50 S

• as a sport crankshaft if at the same time the ignition/pole wheel is converted to the Ø20mm type (also for conversion to electronic ignition): V90, V100, SS90, 90 Racer, PV125, ET3, PK50 S, PK80 S, PK125 S