## Polini Evolution II 107mm Rear Clutch Bell Minarelli 2T - Unrivaled Performance and Durability The Polini Evolution II clutch bell is a top-of-the-line product designed to maximize performance and lifespan in scooters with Minarelli 2T engines. This bell is the result of years of research and development, combining low weight, excellent cooling, and exceptional durability. ### Innovative Solutions for Optimal Performance The integrated cooling ring acts as a heat sink while also reinforcing the bell's structure. Large ventilation "windows" ensure phenomenal airflow, preventing clutch overheating even during intensive use in the most powerful scooters. The Evolution II bell can withstand all loads, guaranteeing smooth and reliable operation. ### Why choose the Polini Evolution II bell? * **Exceptional Durability:** The bell's construction ensures long-lasting and trouble-free operation, minimizing the need for frequent replacements. * **Low Weight:** The reduced weight of the bell contributes to improved scooter dynamics. * **Excellent Cooling:** The innovative cooling system prevents clutch overheating, extending its lifespan and ensuring optimal performance. * **Precise Manufacturing:** The Polini brand guarantees the highest quality workmanship and attention to detail. ### Installation and Compatibility Tips The bell has an inner diameter of 107mm. Minarelli engines (Aprilia, MBK, Yamaha, etc.) from approximately 1996 used 107mm bells, earlier models used 105mm. Before purchasing, please ensure your original clutch bell is either 105mm or 107mm in diameter. Keeway / CPI / Zipp engines also had variations - please verify the bell diameter is 107mm before ordering. The bell is equipped with an external heat sink. Due to the increased external dimensions, it may interfere with the CVT transmission cover in some vehicles. Please check before installation and make appropriate modifications to the cover if necessary. A worn clutch bell can be identified by a characteristic blue-purple discoloration - in such cases, the bell must be replaced. A worn clutch bell negatively impacts clutch performance, which can reduce overall performance.