Why does a motorcycle fail to start when it's cold?

[ClaytonLee]

Solutions for a motorcycle engine failing to start when too cold are: 1. Check the carburetor, fuel mixture ratio, fuel level, and choke; 2. Inspect whether the valve clearance is too small or if there is air leakage; 3. Check if the high-voltage spark for ignition is strong enough; 4. Open the choke to force start. The reasons why a motorcycle engine fails to start when too cold are: 1. Low cylinder pressure, leading to poor atomization of the mixture provided by the carburetor or fuel pump at low temperatures, making it difficult to ignite; 2. High engine operating resistance at low temperatures. Methods to prevent a motorcycle engine from failing to start when too cold are: 1. Replace the engine oil with a lower viscosity oil suitable for winter use; 2. Clean carbon deposits.