Variator spring Honda SH 350 ie Euro 5 / Kymco X-Citing 400 18-20 Polini

The hardness of the clutch spring determines whether the mechanism opens the clutch to engage with the bell at higher or lower engine revolutions.
A stiffer spring will make the clutch "engage" at higher revolutions and, as a result, the motorcycle will take off faster from a standstill and you will notice better acceleration. In other words, a soft spring is like starting in "second gear", while with a stiff spring it is like starting in "first gear".
Attention!! when making your choice, as if it is too stiff, you will need more power and more RPM to take off from a standstill.

The Polini springs are made of steel with a high-carbon silicon alloy, heat-treated to better withstand high temperatures, and do not lose their properties at high temperatures or with use.