What are the reasons why a motorcycle starts and then stalls after a few sounds?

[VanessaFitz]

The main reasons why a motorcycle starts and then stalls after a few sounds are as follows: 1. The idle air jet is clogged, and the idle device is malfunctioning. 2. The spark of an individual cylinder's spark plug is too weak, or an individual valve is not tightly sealed. 3. The intake manifold is leaking, the ignition timing is too early or too late, or the idle speed is improperly adjusted. Below are additional details: 1. When the engine idle is unstable, the first step is to adjust the idle speed. If the issue persists after adjustment, check whether the idle jet and idle air jet are clogged. If the jets are clogged, they can be cleaned with gasoline or acetone and blown clear with compressed air. 2. If the jets are not clogged, stabilize the engine at a certain speed and listen for any air leaks at the intake manifold or the middle and lower gaskets of the carburetor. 3. If there is a leak, it can be resolved by tightening screws or adding/removing gaskets.