Description
Oversize variator Polini Hi-Speed Evolution 2 for Polini P.R.E.
Polini has developed the matching Hi-Speed Evolution 16 mm variator – 12.5° for the revolutionary P.R.E. (Polini Racing Engine) crankcase, designed for the Piaggio ZIP. This Hi-Speed variator has been further improved and adapted specifically for the P.R.E. setup, with a special 12.5° ramp angle for even better performance.
The main difference to the standard Hi-Speed Evolution variator is the changed angle of the variator to improve acceleration on tuned engines. It is an oversize variator and should be used with the corresponding oversize components.
Advantages of the Polini Hi-Speed CVT
Polini applied its extensive experience and know-how to develop a variator that delivers a clear performance boost over the stock variator, providing stable power transfer and improved acceleration across the entire RPM range. Your scooter revs more aggressively and achieves a higher top speed.
The EVO 2 uses DLC (Diamond Light Carbon) bushings — lightweight, low-friction, and extremely durable. Two high-quality seals ensure consistent lubrication. The cores of the variator rollers have polished sliding surfaces, and the sleeves feature a heat- and wear-resistant Nylon/Aramid coating. The included spring with anti-torsion spring seat has +8% tension, slightly stiffer than the stock spring.
Advantages of oversize CVT
Oversize CVT systems extend the entire transmission range and can handle much more power than standard CVTs, which primarily pays off in the upper speed range. They are therefore primarily intended for powerful engines with a lot of power at high RPM. They result in smooth shifting behavior and prevent RPM fluctuations.
While oversize variators can be used with a standard pulley, optimal performance is achieved only with an oversize pulley and a longer oversize drive belt.
Details Polini Hi-Speed CVT
- Complete variator with bushing and ramp plate
- 2 sets of CVT weights 19 x 15.5mm, 4.3g + 3.8g
- 8% reinforced contra spring with Evo Slider spring seat
- Shims and nut
The bushing has a 16mm diameter, so it must be used with a 16mm crankshaft stub.
Polini Hi-Speed
The famous Polini brand lists their "Hi-Speed" CVT as part of their catalog for many years. Of course, the CVT has been upgraded and improved over time, but the basic principle is still the same: a tuning variator for original and slightly tuned engines with a noticeable increase in performance compared to the original variator.
Performance Polini High Speed CVT
With newly calculated and optimized angles, the Hi-Speed variator allows an extended power band. This shows above all in noticeably better acceleration, but also in a slightly higher top speed.
Two integrated O-rings provide the sleeve with better lubrication, resulting in less friction.
The low-friction, robust chrome coating ensures reduced wear and increased service life.
For heavily tuned engines and engines with a significantly larger displacement, it is worth using an overrange CVT.
scooter CVT
Modern scooters are equipped with a continuously variable transmission, the so-called CVT, also called variator.
CVT Parts:
- Front pulley, movable. It contains the variator weights and has a special shape with an inclined surface to allow the V-belt to move freely up and down.
- Ramp plate: Holds the weights in place.
- Variator sleeve: Serves as a bearing for the variator, which moves axially back and forth, i.e., opens and closes.
- CVT roller weights: Adjustment weights that play a critical role in function and performance.
original, Sport and Oversize CVTs
- Original: Original or OEM quality CVTs are equipped with a restrictor to limit the speed to 45km/h. There are riders who remove the restrictor to derestrict their scooter and unleash the full performance without restrictions.
- Sport: Sport CVTs are lighter than the original and are characterized by special angles and a special coating, which increases the top speed, but especially acceleration.
- Oversize: Based on the same principle as the Sport CVT, but has larger dimensions. With an oversize / overrange vario, the performance of the scooter can be increased even further.
You should also always replace the V-belt when replacing the CVT or go for a complete CVT kit.
How to install a CVT transmission ?
| CVT Variator Polini Hi-Speed Evo 2 16mm - 12,5° Piaggio | |
|---|---|
| Article no. | U241.749 |
| EAN | 8054705116810 |
| Weight | 0,83 kg |
| Series | Hi-Speed |
| Brand | Polini |
| Product type | CVT |
| Range | Oversize |
| Roller size | 19 x 15,5 mm |
| Roller weight | 3,8 gr, 4,3 gr |
