If your bike's engine turns off when you apply the brakes or stop in traffic, there could be a few possible reasons for this issue. Here are some steps you can take to diagnose and potentially solve the problem:
Check the side stand: Many bikes have a safety feature that cuts off the engine if the side stand is down while the bike is in gear. Make sure the side stand is fully retracted when you're riding.
Inspect the brake light switch: The brake light switch is responsible for turning on the brake light and may also have a connection to the engine cutoff mechanism. Check if the switch is functioning properly and if it's adjusted correctly to activate when you apply the brakes.
Check the clutch lever switch: Similar to the brake light switch, some bikes have a switch connected to the clutch lever that disengages the engine when the clutch is engaged. Ensure that the switch is working correctly and properly adjusted.
Examine the electrical connections: Inspect the wiring connections related to the engine cutoff system, including those connected to the brakes, clutch lever, and side stand. Look for any loose, damaged, or corroded connections and repair or replace them as necessary.
Verify the idle speed and carburetor/fuel injection system: A low idle speed or improper adjustment of the carburetor/fuel injection system can cause the engine to stall. Check the owner's manual for the recommended idle speed and adjust it if necessary. If you're unsure about carburetor or fuel injection adjustments, it's best to consult a professional mechanic.
Consider the fuel delivery system: Insufficient fuel flow to the engine can cause stalling. Ensure that the fuel tank has enough fuel and that the fuel lines and filters are clean and free from blockages.
Consult a professional mechanic: If you've gone through the above steps and the issue persists, it's recommended to seek assistance from a qualified mechanic. They have the expertise and specialized tools to diagnose and resolve complex bike issues.
Remember to prioritize your safety while riding. If your bike keeps stalling, it's important to address the problem before continuing to use it on the road.