Polini Evolution Crankshaft Vespa Primavera/PK/FL 2-Stroke stroke 54mm connecting rod 105mm

From Polini, tested in the legendary 500km Pomposa race, they present the new Crankshaft Evolution Stroke 54 and 105mm connecting rod.

Its installation requires a series of modifications to the crankcase, such as increasing the diameter and width of the Crankshaft chamber.

Specific for the cylinder 140.0227

Attention! It is necessary to carry out balancing checks before installing in the engine, since manufacturers deny warranty for any balancing fault detected after installation.