POLINI WAVE SPRING
Polini and Vespa, the evolution goes on with the wave spring, a spiral of newly conception produced with high precision construction techniques.
Thanks to the new honeycomb structure, it guarantees excellent flatness on the thrust faces of the clutch and it tolerates loads over 200 kgs. The Polini wave original spring is calibrated to have a load of 80 kg that can be modified with the setting shims supplied that allow a load variation till 200 kg of trust.
The spring is perfectly housed in the clutch hub that has been designed with a proper centring seat. The clutch hub and the pushing disc plates are made of nitrided steel machined from a block. The clutch discs have been finished with a material able to increase the friction coefficient to improve its seal under strain.