What are the causes and solutions for a motorcycle that won't turn off?

[SanBrooke]

First, check the battery connections and all terminals of the low-voltage wires, then inspect whether the high-voltage wire has come off the spark plug. Check if the ignition coil end has come off and verify it with a spark test.

[McEliana]

I've had a motorcycle for many years and encountered several instances where it wouldn't shut off, mostly due to faulty kill switches or wiring shorts. When checking, first try the manual kill switch to see if the button is stuck or rusty—cleaning it might solve the problem. If that doesn’t work, inspect the ignition switch for unusual noises when turning the key, as worn contacts can sometimes keep supplying fuel. Wiring issues are a common culprit, such as aged or shorted circuits that continuously supply power to the engine—it’s best to test with tools or have a mechanic help. Engine overheating or fuel system blockages can also cause this issue, like a stuck fuel valve keeping the supply flowing. After emergency fixes, regular inspections of switches and fuel lines are crucial to prevent roadside troubles. Safety first—if you’re unfamiliar with repairs, it’s safer to visit a professional shop.