If your motorcycle stalls or turns off when you shift into first gear, there could be a few potential causes and solutions to consider:
Clutch Engagement: One common reason for stalling when shifting into first gear is improper clutch engagement. Ensure that you are fully disengaging the clutch lever when starting the bike and shifting into gear. If the clutch is not fully engaged, the engine may not receive enough power to keep running, resulting in a stall. Practice releasing the clutch gradually and smoothly to find the sweet spot where the engine remains running.
Idle Speed: The idle speed of your motorcycle might be set too low. The idle speed is the engine's rotational speed when it is at rest. If the idle speed is too low, the engine may not have enough power to stay running when you engage the clutch and shift into first gear. Consult your motorcycle's manual or a qualified mechanic to determine the appropriate idle speed for your specific model, and adjust it if necessary.
Fuel or Air Delivery Issues: Stalling can also occur if there are problems with the fuel or air delivery systems. Check that there is sufficient fuel in the tank and that the fuel lines are clear and not clogged. Additionally, inspect the air filter to ensure it is clean and not obstructed. If you suspect a fuel or air delivery issue, it is advisable to have your motorcycle inspected by a professional mechanic to diagnose and resolve the problem.
Mechanical Issues: In some cases, stalling when shifting into first gear could be indicative of underlying mechanical problems, such as a malfunctioning clutch, worn-out components, or an issue with the transmission. If the issue persists after checking the clutch engagement and idle speed, it is recommended to take your motorcycle to a qualified mechanic for a thorough inspection and diagnosis.
Remember, the information provided here is general in nature, and it's always best to consult your motorcycle's manual or seek professional assistance from a mechanic who can assess and address the specific issues with your bike.