Why does the motorcycle start but not move when accelerating?

[HadleyLynn]

The motorcycle can start but does not move when accelerating due to the following reasons: Faulty automatic centrifugal clutch: Improper clutch operation or failure to reset may cause the motorcycle to start but not accelerate or move. A damaged automatic centrifugal clutch needs to be replaced or repaired. Broken drive belt: Usually caused by a faulty pulley or belt, which requires opening the rear transmission system for inspection. If the belt is broken or has significant gaps, it must be replaced. Small sprocket detachment or rear sprocket chain drop: Inspection and repair are needed. Carburetor water ingress or blockage, or burnt spark plug: Check if the fuel line is blocked. Loosen the screw at the bottom of the carburetor to let the gasoline inside flow for a while, then tighten it. If dirt has entered the carburetor, inspect the spark plug as well. A carburetor that has been used for a long time may need cleaning or replacement, and a burnt spark plug should be replaced with a new one.