What is the principle behind easier starting when opening the choke?

[VanDonovan]

Opening the choke makes starting easier by enriching the fuel mixture. Specific reasons: The motorcycle choke is a mechanism specifically designed for cold starts. The choke is used to enrich the mixture during startup, meaning it provides more fuel during ignition. This is because during a cold start, the carburetor has not yet vaporized the fuel, resulting in a lean air-fuel mixture. Therefore, in winter, slide carburetors generally require the use of a choke to enrich the mixture. However, in summer when temperatures are high, the choke is usually not needed for starting. Other methods to assist starting: In winter, when temperatures are low, engine oil tends to thicken and clump together. This often causes motorcycle engines to struggle, resulting in low-speed rotation. Additionally, running in humid or dusty areas can allow more impurities to enter the cylinder, potentially clogging oil passages. These situations require frequent oil changes. Different temperatures require different types of engine oil, and timely oil changes can improve vehicle performance.