The clutch of a pedal motorcycle can only drive the rear wheel to rotate after the centrifugal force of the pawl block combines with the bowl spring. There is friction leather on the pawl block, which is similar to the principle of the brake pad. The friction leather of the pawl block becomes thinner as it wears down.

Pedal motorcycle clutch plate

The friction leather and the bowl spring are combined. If the accelerator is slightly depressed during the starting process, the engine speed increases a little, and at this point, the vehicle is still in a state of not moving, then the friction leather of the clutch plate will continue to rub against the inside of the bowl spring. This will accelerate the wear of the friction leather of the clutch plate and reduce its service life. The dust that is worn off will accumulate in the transmission box. Over time, the dust accumulates more and more. Once it enters the bearings, it will cause the bearings to get stuck. Or the dust on the belt surface will also cause the friction force between the belt and the fan disc and the clutch to decrease, resulting in belt slipping.

Bowl spring turns blue

And the friction heat caused by long-term semi-engagement will also cause the bowl spring to turn blue. When the clutch is disassembled, from the phenomenon of turning blue, we can determine that the friction leather of the clutch plate and the inside of the bowl spring often have friction and high temperature. And the friction also leads to a decrease in the combined friction force. This is similar to the brake pads. There are low-temperature friction coefficients and high-temperature friction coefficients. And pedal motorcycles, due to their own usage characteristics, manufacturers will choose materials with strong low-temperature friction force.

Clutch plate

Therefore, pedal motorcycles should not start gently every time. The correct approach is to start decisively and do not allow the friction leather of the clutch plate to constantly rub against the inside of the bowl spring. But also do not fully depress the accelerator at the start. This is not only unsafe but also reduces the service life of the belt.

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