Description
By tuning expert Polini: Polini Pulley Ceramic Air Speed Evolution 12.5° Piaggio Zip / Piaggio LC, the perfect pulley for the Hi-Speed Evolution variators which in turn was developed for Polini's state-of-the-art P.R.E. high-end racing engine.
The key difference with the standard Polini Evo pulley is the different pulley angle; it was re-calculated and improved in order to improve acceleration and performance in very powerful tuned engines. The pulley should be used in combination with the 12.5° Hi-Speed Evolution variator from Polini to reach its full potential.
CVT Pulleys
Pulleys are an integral part of the CVT system on scooters and mopeds with automatic CVT transmission.
The continuously variable transmission consists of fixed and moving pulleys, the V-belt rises and falls between them depending on the engine speed, changing the speed of the vehicle.
When should you change a pulley?
There are two reasons for replacing pulleys:
- Wear and tear. Although pulleys are relatively durable, the constant sliding of the V-belt can deform the surface.
- Tuning. Different pulley angles and diameters can improve the handling of scooters or mopeds.
Note: A CVT variator can only do a good job when CVT pulleys as well as torque drive pulleys are compatible with each other. Pitches and diameters of the individual elements must be matched so that the V-belt can glide evenly.
