Torque Spring Naraku +1500 rpm GY6 / Kymco / Honda
Description
Torque Spring Naraku Sport V.2 - +1500 rpm. For Piaggio / GY6 / Kymco / Honda etc.
Naraku improved their contra springs, the alloy was modified and is more resilient, and the springs carry a marker specifying the type of spring.
Whenever you tune your engine, you should think about using a different torque spring, otherwise the belt might slip or the engine might be kept from revving up to top rpm. Any change in torque spring strength has a direct impact on shifting characteristics and acceleration. Keep in mind - harder does not necessarily mean better, it all depends on the rest of your set-up (cylinder, clutch, variator weights etc.)
Naraku indicates the rpm shift on the springs themselves, provided the variator settings / weights remain unchanged. This makes it easier to foresee changes than a vague value in %. This spring will make the CVT shift gear ratios +1500 rpm later.
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 torque driver and the clutch. As soon as you accelerate and the engine revs up, the spring is released by centrifugal force. This causes the torque drive 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 ?
| Torque Spring Naraku +1500 rpm GY6 / Kymco / Honda | |
|---|---|
| Article no. | NK900.75 |
| EAN | 4250362417916 |
| Weight | 0,17 kg |
| Brand | Naraku |
| Product type | Torque spring |