Yamaha T-Max 500/530 Evo Slider Clutch Spring +15% Polini

15% Spring at the origin

The hardness of the contrast spring plays an important role in transmitting the engine's power to the rear wheel.
It exerts back pressure on the rear pulleys and therefore has a considerable influence on the operation of the variator. The contrast spring is usually harder if the belt tends to slip, if the variator does not operate at the optimal RPM level, or if the engine, despite light weights, continues to run below the optimal RPM.
What negatively affects engine performance is a twisted contrast spring. With the Evo-Slider plate, the manufacturer Polini provides a solution to this problem.

This is a small plate that is mounted between the contrast spring and the clutch, which reduces torsion to a minimum. In addition, the Polini Evo-Slider absorbs pulley vibrations at high RPM.
The result is a smoother engine and better power transmission to the rear wheel.
The thicker the diameter, the harder the contrast spring.

The kit includes a harder spring and an Evo-Slider spacer.
The Polini Evo-Slider allows the spring to rotate, which significantly improves the Maxiscooter's behavior when starting from a standstill and throttle response