Crankshaft Polini HPC 12mm Minarelli Horizontal

The Polini HPC 12mm crankshaft is a reinforced and balanced crankshaft designed for Minarelli Horizontal engines equipped with a 12mm piston pin.

It is intended for sport and mid-race builds, where a stock crankshaft begins to show its reliability limitations.

HPC (High Primary Compression) technology improves crankcase filling, resulting in better engine response, cleaner torque, and more stable revving.

Connecting rod: 80mm
Stroke: 39.2mm (stock)
12mm model: Needle bearing (compatible with other diameter bearings)