What Causes a Scooter to Jerk When Accelerating?

[CarolineDella]

Scooter jerking when accelerating is often due to the vehicle's half-shaft experiencing bending, twisting, breaking, or spline wear and misalignment under long-term torsional fatigue and impact forces. This can cause rhythmic shaking of the vehicle's front end when accelerating within a certain speed range, with the shaking disappearing or reducing upon releasing the throttle. Solution: Regularly replace the half-shaft. Working Principle of Scooter Transmission System: The transmission mechanism of a scooter operates through two pulley disks connected by a drive belt. At idle speed, the pulley disks and drive belt remain loose, unable to propel the motorcycle forward. As engine speed increases, centrifugal force causes the pulley disks to engage more tightly with the belt, changing the gear ratio. Higher engine speeds result in greater gear ratio changes, leading to faster vehicle speeds. Maintenance of Scooter Transmission System: After covering the transmission case, the airflow guide on the front pulley disk creates a directional air flow inside the transmission case. This serves two purposes: cooling the transmission system and expelling dust generated during operation to prevent excessive wear of internal components.