There could be several reasons why your motorbike starts but then dies after a short period of time. Here are a few potential causes to consider:
Fuel Issues: Check if you have enough fuel in the tank and ensure that the fuel valve is set to the "on" position. If the fuel is old or contaminated, it may not ignite properly and cause the engine to stall.
Carburetor Problems: The carburetor is responsible for mixing air and fuel in the proper ratio for combustion. If the carburetor is dirty or clogged, it may not deliver the right amount of fuel, leading to engine stalling. Cleaning or adjusting the carburetor may be necessary.
Air Intake Issues: Inspect the air filter and make sure it is clean and not obstructed. A clogged air filter can restrict airflow to the engine, affecting its performance and causing stalling.
Ignition System Malfunction: Check the spark plugs and ignition system components (such as the ignition coil) to ensure they are functioning properly. Faulty spark plugs or ignition components can lead to weak or no spark, resulting in engine shutdown.
Electrical Problems: Faulty wiring, loose connections, or a malfunctioning battery can cause intermittent power supply to the engine, leading to stalling. Inspect the electrical system for any visible issues.
Engine Overheating: If the engine is overheating, it may start but then shut down as a safety measure. Check the coolant level and ensure proper circulation. Clean the radiator fins if they are dirty, and verify that the cooling fan is functioning correctly.
It is recommended to consult a professional mechanic or technician if you are unsure about diagnosing or fixing the issue yourself. They will have the expertise and tools to identify the exact cause of the problem and provide the necessary repairs.