Clutch spring Yamaha Majesty 400 >09 Evo Slider +15% Polini

Spring 15% stiffer at origin

The stiffness of the contrast spring plays an important role in the transmission of power from the engine 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 stiffer if the belt tends to slip, if the variator is not running at the optimum RPM or if the engine is still running below the optimum RPM despite light weights.
A twisted contrast spring has a negative effect on engine performance. With the Evo-Slider plate, the manufacturer Polini has solved this problem.

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

The kit includes a stiffer spring and an Evo-Slider supplement.
The Polini Evo-Slider allows the spring to rotate, which significantly improves the handling of the Maxiscooter when cornering and the throttle response.

Valid for:
MBK Evolis ABS 400i H2O 4T E3 2014-2016
MBK Evolis ABS 400i H2O 4T E4 2017
MBK Evolis II ABS 400i H2O 4T E4 2018
Yamaha Majesty 400i H2O 4T E3 2007-2008
Yamaha Majesty 400i H2O 4T E3 2009-2011
Yamaha X-Max III 400i H2O 4T E3 2013-2016
Yamaha X-Max III ABS 400i H2O 4T E3 2013-2016 Yamaha X-Max III ABS 400i H2O 4T E3 2013-2016
Yamaha X-Max III ABS 400i H2O 4T E4 2018-2016 Yamaha X-Max III ABS 400i H2O 4T E4 2017
Yamaha X-Max IV ABS 400i H2O 4T E4 2018-2020