Torque spring POLINI +5% for Piaggio Beverly, X10 350ie 4V

Polini springs that increase pressure by 5% and are therefore ideal for lightly tuned engines. The springs press the gear on the rear converter onto the belt. They also create pressure to shift the variator. A lighter pressure is required once a motor has been tuned to prevent the engine from moving into a dangerously high rev range. The pressure of the springs is closely tied to the variator. If a spring is fitted, it must be matched to the variator. Original spring weight: 54/55mm/kg. Polini spring weight: 54/58mm/kg. Spring thickness: 5.4mm. Total length: 127mm. Internal diameter: 61.7mm. Number of coils: 5.5.