There are a few potential reasons why a motorcycle might stall when releasing the clutch. Here are some common causes:
Insufficient throttle: Motorcycles require a certain amount of throttle to maintain engine power and prevent stalling. If you release the clutch too quickly without giving enough throttle, the engine may not have enough power to keep running, causing it to stall.
Incorrect clutch adjustment: If the clutch is not properly adjusted, it may engage or disengage too abruptly, leading to a stall. The clutch should have the correct amount of play and engage smoothly when releasing the lever.
Clutch slippage: If the clutch plates are worn or the clutch cable is loose, the clutch may slip when you release it. This can prevent the power from transferring effectively to the wheels, resulting in a stall.
Engine idle speed: If the motorcycle's idle speed is set too low, it may not provide enough power to keep the engine running when you release the clutch. Adjusting the idle speed to the manufacturer's specifications can help prevent stalling.
Faulty fuel system: A clogged fuel filter, dirty carburetor, or fuel pump issues can affect the fuel supply to the engine, resulting in stalling when the clutch is released. Regular maintenance and cleaning of the fuel system can help prevent such problems.
Mechanical issues: Various mechanical problems, such as a faulty ignition system, worn spark plugs, or low compression, can contribute to stalling when the clutch is released. These issues require proper diagnosis and repair by a qualified mechanic.
Remember, each motorcycle model can have its own specific reasons for stalling, and it's always a good idea to consult the owner's manual or seek professional assistance if you're experiencing persistent stalling issues.