torque spring Polini reinforced for Piaggio Bravo, Boss, Ciao, Grillo, SI 243.012

The torque spring has the task of pressing the pulley in the rear converter to the belt. It also exerts pressure to allow the variator to shift. A stronger spring is required once engines have been tuned otherwise the belt slips or the engine doesn`t rev well. The torque spring is always in close contact with the variator. If another spring is mounted, the Vario must be adapted to each upgrade.