Piston Polini Evolution 50cc d=40.2mm / piston pin=12mm (B)

Original spare part from Polini for the Polini 50cc Evolution cylinders: replacement piston with 12mm pin for Piaggio and Minarelli. The piston is available in several sizes (A, B, C and D); the size differences are minimal. For regular replacement, we recommend to choose the size stamped on your original piston. For worn down cylinder bores, you can go a size or two bigger.

• piston pin 12mm
• single ring
• diameter 40.2mm
• size B