What is the reason for a motorcycle stalling when the throttle is applied after starting?

[VanJeremiah]

Motorcycle stalling when the throttle is applied after starting can be attributed to the following reasons: Excessively rich air-fuel mixture: Simply put, an excessively rich air-fuel mixture in the engine means there is too much fuel being injected. This is usually caused by a faulty oxygen sensor or inaccurate air intake measurement. When this happens, the motorcycle stalls, typically due to ignition system failure or fuel system issues. Excessively lean air-fuel mixture: An excessively lean air-fuel mixture means there is too little fuel being injected. In contrast to the above scenario, if the needle seat and emulsion tube fall into the fuel pool, the needle won't be lifted as the piston rises, thus failing to supply sufficient gasoline. This results in an overly lean mixture that cannot be ignited.