Polini Speed Bell clutch bell, 107 mm, Minarelli

Reinforced Polini Speed Bell clutch bell. Modeled after the Polini Evolution bell. Excellent quality and extremely durable. Designed for tuned scooters, it boasts an incredible durability in original engines. Good to know! A worn clutch bell can be recognized by its characteristic bluish-purple discoloration - in this case, the clutch bell needs to be replaced. A worn clutch bell adversely affects clutch operation, which can reduce performance. Weight: 429g. NOTE: The bell has an internal diameter of 107mm. Minarelli engines (Aprilia, MBK, Yamaha, etc.) used 107mm bells from around 1996, previously 105mm. Please confirm whether the original clutch bell has a diameter of 105mm or 107mm before ordering. There were also changes in Keeway / CPI / Zipp... engines - before ordering, make sure the bell diameter is 107mm.