There could be several reasons why a motorcycle dies or stalls when selecting the first gear. Here are a few possibilities:
Clutch Engagement: Motorcycles have a manual transmission, and engaging the clutch is necessary to shift gears. If the clutch is not fully disengaged when shifting into first gear, the motorcycle may stall. This can happen if the rider releases the clutch too quickly or does not pull in the clutch lever fully before shifting.
Idle Speed: Motorcycles have an idle speed setting that keeps the engine running when the bike is stationary. If the idle speed is set too low, the engine may not have enough power to sustain itself in first gear, resulting in a stall. Adjusting the idle speed may resolve the issue.
Fuel Delivery: Inadequate fuel delivery can cause a motorcycle to stall when shifting into first gear. This can occur due to a clogged fuel filter, a malfunctioning fuel pump, or carburetor issues. If the engine is not receiving enough fuel, it may not have the necessary power to stay running in first gear.
Mechanical Issues: There could be mechanical problems within the motorcycle that contribute to stalling when selecting first gear. Faulty spark plugs, a malfunctioning ignition system, or issues with the throttle or throttle cables can all affect the engine's performance and cause stalling.
Clutch System Problems: Problems with the clutch system itself can also result in stalling. A worn-out clutch plate, insufficient clutch cable tension, or a malfunctioning clutch release mechanism can prevent the clutch from fully engaging or disengaging, causing the motorcycle to stall when shifting into gear.
If you are experiencing this issue with your motorcycle, it is recommended to have it inspected and serviced by a qualified mechanic. They will be able to diagnose the specific problem and carry out the necessary repairs or adjustments to ensure smooth gear engagement.