Piaggio scooter 50cc Malossi clutch spring

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. In other words, a soft spring is like starting in "second gear", while with the stiff spring it is like starting in "first gear". Note!! Be careful with your choice, as if it is too stiff, you will need more power and more RPM to start from a standstill.
The Malossi 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.

Spring hardness:
White: 30% harder than original
Green: 60% harder than original
Lilac: 82% harder than original
Blue: 106% harder than original
Black: 114% harder than original