Description

Polini Evo-Slider Contra Spring for Aprilia / Piaggio / SYM / Kymco / Honda

The contra spring is key to getting power to the rear wheel.

It controls how your variator holds RPM and delivers performance.

A stiffer spring helps fix belt slip, keeps RPM in the sweet spot, and stops the engine from bogging at low revs. But if the spring twists or deforms, performance takes a hit.

That’s where the Polini Evo-Slider comes in. It sits between the spring and clutch to reduce torsion, cut vibrations, and keep everything stable at high RPM. As result you’ll get smoother power delivery, quicker variator response, and cleaner acceleration.