In what way does a traditional choke make it easier for the engine to ignite fuel?

A traditional choke primarily works by enriching the fuel-air mixture. When the choke is engaged, it restricts airflow into the engine, which leads to a higher concentration of fuel in the mixture that reaches the combustion chamber. This enriched mixture is beneficial for starting the engine, especially under cold conditions or when the engine is not warmed up.

When temperatures are low, the fuel vaporizes less efficiently, making it more challenging for the engine to ignite the fuel. By reducing the amount of air and increasing the amount of fuel in the mixture, the choke helps create a more combustible environment for ignition, facilitating easier starts.

The other options, such as increasing airflow or reducing fuel pressure, do not directly contribute to the enrichment of the fuel-air mixture. Likewise, decreasing engine temperature does not assist with ignition, as a warmer engine typically supports better combustion efficiency. Thus, the enrichment of the fuel-air mixture provided by the choke is the critical factor that aids in engine ignition.