Check the Neutral Safety Switch. The neutral safety switch is responsible for preventing the bike from starting unless it is in neutral gear. If this switch is not working properly, the bike may start in gear and stall when you let go of the clutch lever. Check the neutral safety switch for damage or loose connections and repair or replace it if necessary.
Check the Kickstand Switch. The kickstand switch is a safety feature that prevents the bike from being put into gear if the kickstand is down. If this switch is not working properly, the bike may be put into gear with the kickstand down, causing it to stall when you let go of the clutch lever. Check the kickstand switch for damage or loose connections and repair or replace it if necessary.
Check the Ignition System. If the ignition system is not working properly, it can cause the bike to stall when you put it in gear. Check the spark plugs, spark plug wires, and ignition coil for damage or loose connections and repair or replace them if necessary.
Check the Fuel System. If the fuel system is not working properly, it can cause the bike to stall when you put it in gear. Check the fuel tank for obstructions, the fuel filter for clogs, and the fuel lines for leaks or kinks, Check that the petcock is open allowing the fuel to flow to the carbs. Clean or replace any blocked or damaged components as necessary.
Check the Battery and Charging System. If the battery is not holding a charge or the charging system is not working properly, it can cause the bike to stall when you put it in gear. Check the battery connections for damage or loose connections and clean them if necessary. Check the charging system for proper output voltage and repair or replace any damaged components as necessary.
Check the vacuum lines and diaphragm: Worn or leaky vacuum lines, and cracked or damaged diaphragms can cause the engine to stall when put into gear. Inspect all the vacuum lines for cracks or damage and replace them as needed. Check the diaphragm for cracks or splits, and replace it as required.
Check for fuel flow: If the fuel flow to the engine is obstructed or restricted, the bike may stall or jerk when put into gear. Check the fuel lines for kinks or restrictions and clean the fuel filter. Make sure the fuel tank has enough fuel.
If you have checked all of the above items and the bike is still stalling when you put it in gear, you should take it to a qualified mechanic for diagnosis and repair.
