Piaggio Evolution Polini Clutch Springs

The contrast spring plays an important role in the adjustment of the variator. By exerting counterpressure on the rear pulleys, it influences the variator's shifting.

The spring should be reinforced when the belt tends to slip, if the variator does not work continuously, or if the engine, despite lighter rollers, continues to run at a very low number of revolutions.
When changing the spring, the variator must be readjusted.

White spring hardness -30%
Blue spring hardness -8%

* Attention: Valid for Minarelli scooter engines equipped with oversized pulleys.