Racing Torque Spring + Evo Slider Polini d=3.8mm Yamaha Aerox \/ BW’s – Spring rate: +40%

Polini Racing Torque Spring + Evo Slider.

The “Evo Slider” spring seat allows the spring, not sitting directly on the pulley, to “slide” in its seat instead of getting twisted when the torque drive is opening. The performance of your transmission will be improved, the engine will run smoother, and the springs will last longer.

Available in 2 versions for Minarelli: 3.6mm and 3.8mm (softer and harder).

d= 3.8mm