Clutch springs MBK Booster > 2004 Jasil

Jasil presents the springs for Yamaha Bw's / MBK Booster 50cc.

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. A twisted contrast spring negatively affects engine performance.

Spring hardness:

White: 31% harder

Yellow: 47% harder

Red: 57% harder