Description
Polini Torque Spring +25%
Polini offers contra springs for most scooters and maxi scooters. In general, there are various approaches to setting the variator as precisely as possible in order to get the best performance out of an engine.
In tuned engines, the weight of the rollers should generally be adjusted, this has an effect on the opening speed of the front pulley. In many cases this means that the torque spring has to be readjusted so that the correct tension of the V-belt is maintained so rear and front pulley can work in harmony.
Specifications of Polini spring:
- Diameter: 4,9 mm
- Stiffness: +25%
Contra spring
The contra spring, or torque spring is part of all scooters and mopeds with CVT transmissions.
function of torque spring
The 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 engine components, you need to find the right balance here.
- A spring that is too hard cannot fully expand. Acceleration is improved, but the V-belt cannot move outward to the maxi and top speed will be lowered.
- A spring that is too soft will relax too quickly, affecting the pull of your scooter.
Tip: To determine whether the V-belt can move to its maximum achievable position, you can mark the maximum position with a felt-tip pen on the CVT. If the mark disappears, this indicates that the belt actually moves up to the max position, i.e. the spring is not too hard.
How to change the torque spring ?
| Contra Spring Polini +25% Honda Forza 300 | |
|---|---|
| Article no. | P243.082 |
| EAN | 8054705079122 |
| Weight | 0,19 kg |
| Brand | Polini |
| Product type | Torque spring |