How to Solve Scooter Starting Shaking and Jerking?
2 Answers
There are corresponding solutions for different causes of shaking during scooter starting. Below are the specific solutions: 1. The contact area between the friction plate and the working surface of the clutch housing is too small: Apply chalk to the surface of the friction plate of the clutch shoe, install the clutch, start the engine, and accelerate-brake to stop the rear wheel. Repeat this several times, then remove the clutch to check the working contact surface of the shoe friction plate. Use a grinding wheel to polish the surface of the clutch shoe friction plate, ensuring the contact area between the friction plate and the working surface of the clutch housing reaches more than 80% of the total area. 2. Excessive wear of the clutch friction plate: Use a file to trim the chamfers at both ends of the clutch friction plate to increase the chamfer that has been reduced due to wear. 3. Sticking of the clutch shoe on the pin: Clean and lubricate the installation pin of the clutch shoe (i.e., the transmission plate pin) and the pin hole on the clutch shoe to eliminate the sticking of the clutch shoe on the pin. 4. Damage to the small spring of the clutch shoe: Replace the three small tension springs of the clutch shoe to ensure equal tension in all three small springs, thereby eliminating the asynchronous engagement of the clutch friction plate and the clutch housing.
My scooter used to jerk when starting, and later I found out it was a drivetrain issue. The clutch shoes were worn and would slip, especially noticeable during hard acceleration. I opened the transmission case myself for inspection and found the shoe surfaces were completely worn flat. After replacing the entire clutch assembly, the situation improved significantly. I also took the opportunity to clean out the accumulated sludge in the transmission case, and now the starts are much smoother. I recommend checking the thickness of the shoes – if it's less than 3mm, they should be replaced. When riding, try to avoid half-clutch conditions as much as possible to extend the life of the shoes. Also, pay attention to belt tension; if it's too loose, it can easily cause jerking. Regular maintenance is really important—don't wait until it's completely broken to fix it.
