What causes the idle vibration of the Jog-I?

[OLuna]

Jog-I idle vibration may be caused by the following reasons: Carburetor issue: If the carburetor has not been cleaned for a long time, it may lead to unstable idle speed. Engine air leakage: Slight air leakage in the engine can also cause unstable idle speed in motorcycles. The reasons for air leakage can vary, such as overly tight valve clearance, poor sealing at the connection between the carburetor and the cylinder, or damage to the secondary combustion pipe in China III models, all of which can result in engine air leakage. Ignition system failure: Minor damage to the ignition system. In this case, although the vehicle can still start, it may exhibit unstable idle speed similar to a carburetor malfunction.