Crankshaft -POLINI (rotary valve) 51mm stroke, 97mm connecting rod- Conversion shaft Vespa PK50 XL/XL2 to 125cc (Ø 20mm cone)

Polini 51mm rotary slider conversion shaft for Vespa PK50 XL

Very high quality Polini tuning crankshaft. Solid CNC connecting rod, slotted top and bottom. Extended intake angle to increase the time cross-section of the intake and increase performance over the entire rev range. A prerequisite when using larger cylinders/carburetors. However, it also has a noticeable effect on original cylinders.

Well balanced, the Polini shaft offers smooth running.

Technical data:

• Cone: large type (Ø20mm shaft seal)
• Stroke: 51 mm
• Piston pin: 15 mm

Suitable for:

• as a conversion shaft from 50cc to 125cc and larger: Vespa PK50 XL/XL2 (pole wheel/ignition can be retained)
• as a conversion shaft from 50cc to 125cc and larger, if the ignition/pole wheel is converted to the Ø20mm type at the same time (also for conversion to electronic ignition): Vespa V50, 50N, 50 Special, PK50 S
• as a sports crankshaft, if the ignition/pole wheel is converted to the Ø20mm type at the same time (also for conversion to electronic ignition): V90, V100, SS90, 90 Racer, PV125, ET3, PK50 S, PK80 S, PK125 S