Torque Springs Polini Evolution Piaggio / Minarelli

Polini Torque Springs Evolution Piaggio / Minarelli = 2 torque springs, different strengths. Recommended for sport and racing set ups.

• Brand: Polini
• SKU: U243.043
• Availability: In stock

Contra springThe contra spring, or torque spring is part of all scooters and mopeds with CVT transmissions.function of torque springThe contra spring is located between the rear pulley and the clutch. As soon as you accelerate and the engine revs up, the spring is released by centrifugal force. This causes the front pulley to open, which in turn causes the V-belt to move outward on the CVT front pulley. The transmission ratio changes in favor of higherspeed. When the scooter slows down and the engine speed is reduced, the torque spring is compressed again and the V-belt returns to a lower position on the front pulley.soft or hard contra spring?The choice of torque spring depends on different