What are the reasons why a underbone motorcycle won't start when kick-started?

[LaThomas]

There are several main reasons why a motorcycle may not start when kick-started: Idle speed issue: Sometimes the failure to start is due to low idle speed. Normally in summer, the tachometer needle should point to one mark or slightly more. In winter, it should be adjusted to between one and a half to two marks. Spark plug problem: Replacing it can solve the issue. Sometimes the spark plug may be flooded with fuel. Check if the spark plug tip is oily or wet, as this can also prevent the engine from starting. Carburetor problem: If it's been a long time, the carburetor needs to be cleaned. Cold weather in winter: This often makes it difficult to start the engine. In the warmer climate of southern regions, unless there's a fault with the motorcycle itself, starting issues are rare. In northeastern regions during early spring or late autumn when temperatures drop below 0°C in the morning, the engine oil may become too viscous, making it hard to start the engine.