Motorcycle UUU 125 speed difference suddenly vibrates.

Motorcycle UUU 125 suddenly vibrates, and the speed difference is large, probably because the piston ring is broken.

Maybe the ring is broken. Look at the piston ring and carburetor.

Method 1: Re-debug the clutch cable so that the clutch cable is low and the clutch handle is pinched to the end as soon as it is loosened. Give it a try and basically cure this problem.

Method 2: Replace the driving disk and driven disk of the chain together. This kind of vibration is commonly called * * * vibration.