Variator Spring Yamaha X-Max 125 4V Euro 3-4 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.

That is, a soft spring is like starting in "second gear", while with the stiff spring it is like starting in "first gear".

Attention!! in your choice, as if it is too stiff, you need more power and more RPM to start 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.

• Increase in hardness: +12%