High quality crankshaft from Polini for Minarelli vertical engined scooters. Polinis range of crankshafts are of full mass which gives improvements in compression building more power. This model is only for Minarelli vertical 50cc 2 stroke air cooled engines such as the pre-2001 Yamaha Zuma and BW with vertical engines.
Racing quality silver bearing for better heat dissipation. Suggested for race engines up to 15,000 rpm. Suitable for 50cc and 70cc race motors.