A loud bang sound followed by the motorcycle not starting can indicate a potential issue with the engine or ignition system. Here are a few possible reasons for this problem:
Backfire: A backfire occurs when the combustion process in the engine doesn't happen as expected. It can cause a loud bang or popping sound. Backfires can be caused by various factors, such as a rich fuel mixture, an ignition timing issue, or a malfunctioning spark plug or ignition coil.
Engine Seizure: If the motorcycle suddenly stops running and won't start, it could be due to an engine seizure. This happens when there is a lack of lubrication or cooling, causing the internal components to seize up and lock the engine. Engine seizure can result from insufficient oil levels, coolant failure, or mechanical issues.
Fuel System Problems: Issues within the fuel system, such as a clogged fuel filter, a malfunctioning fuel pump, or a blocked fuel injector, can cause inadequate fuel supply to the engine. This can lead to a lean fuel mixture, misfires, or engine stalling.
Electrical Problems: Electrical issues, such as a faulty ignition switch, a broken wire connection, or a dead battery, can prevent the motorcycle from starting. A sudden bang sound during acceleration could be an indication of an electrical short or component failure.
Mechanical Damage: A loud bang sound accompanied by the engine not starting might indicate significant mechanical damage, such as a broken connecting rod, a damaged piston, or a snapped camshaft belt/chain. These severe mechanical failures can prevent the engine from running.
In any case, it is recommended to have the motorcycle inspected and diagnosed by a qualified mechanic or technician. They will be able to perform a thorough assessment, check for error codes, and pinpoint the exact cause of the issue. Based on the diagnosis, they can provide the necessary repairs or maintenance to get your motorcycle up and running again.