There can be several possible reasons for your bike's engine suddenly turning off while riding and experiencing difficulties starting. Here are a few common causes to consider:
Fuel delivery issues: Insufficient fuel supply or a problem with the fuel delivery system can cause the engine to stall. Check if there are any clogged fuel lines, a dirty fuel filter, or a malfunctioning fuel pump. Additionally, a faulty fuel injector or carburetor can also disrupt the fuel-air mixture, leading to engine shutdown.
Ignition system problems: Issues with the ignition system can result in intermittent engine shutdown. Check if the spark plugs are functioning properly, as worn-out or fouled spark plugs can cause misfires and engine stalling. Faulty ignition coils, ignition switch, or faulty wiring connections can also contribute to the problem.
Electrical issues: Faulty electrical components can cause engine shutdown. Ensure that the battery connections are secure and the battery is in good condition. A weak battery or a faulty charging system may not provide enough power to keep the engine running consistently.
Engine overheating: Excessive engine heat can lead to engine shutdown. Check if the cooling system is working properly, including the radiator, coolant levels, and the thermostat. Insufficient cooling can cause the engine to overheat, triggering an automatic shut-off.
Vacuum leaks or air intake problems: Air leaks in the intake manifold or vacuum lines can disrupt the air-fuel mixture, leading to engine stalling. Inspect the intake system for any loose connections, cracked hoses, or damaged intake manifold gaskets.
Given the specific issues you mentioned with starting the engine multiple times before it stays on, it is recommended to have your Pulsar 150 Twin Disc inspected by a qualified mechanic. They can perform a thorough diagnosis and identify the exact cause of the problem. Proper troubleshooting and repairs will help ensure the engine operates reliably and safely.