Motorcycles go by themselves without fuel.

This situation is mostly related to carburetor. For example, the carburetor throttle is stuck and cannot go back, and the carburetor throttle is too tight to go back. Because the throttle of the vacuum film carburetor for scooter is not directly controlled by the throttle cable, the throttle cable can return, which does not guarantee that the throttle and throttle valve can return. In addition, check whether the valve clearance is normal, whether the intake pipe between carburetor and engine and the oil suction pipe of fuel tank switch leak oil, and whether the gasoline is deteriorated. Inferior gasoline may form a sticky substance and stick to the carburetor throttle, making it impossible to return.