What is the function of the choke on a motorcycle?
2 Answers
The choke on a motorcycle is essentially an air intake control valve that regulates the amount of air entering the "fuel-air mixture chamber" in the carburetor (located on the fuel-air mixture system). Its primary purpose is to control the concentration of the fuel-air mixture. Below is relevant information about the motorcycle choke: 1. Location of the choke button on a motorcycle: The choke button is typically located on the left side of the carburetor, marked by a circular position. 2. Meaning of the "N" on the motorcycle choke: The "N" on the motorcycle choke stands for the starting enrichment device. When the button is engaged, the carburetor restricts air intake. Due to the vacuum created by the engine's intake stroke during operation, more fuel is drawn in, making it easier to start the engine when cold. However, when the engine is warm, too little air can cause overheating and other issues, along with significantly increased fuel consumption. Therefore, the choke should be closed once the engine is running normally.
After riding motorcycles for so many years, every winter morning when the bike is particularly hard to start, I rely on the choke to solve the problem. Simply put, the choke is a small switch or lever, usually located near the carburetor. When you pull the choke, it reduces the amount of air entering and increases the fuel, making the air-fuel mixture richer, which helps the cold engine start more easily. Without using the choke, you might have to turn the key several times without success, especially during cold snaps. Once the engine warms up, remember to push the choke back in, otherwise, the overly rich mixture will waste fuel or foul the spark plugs. I ignored this a few times when riding my older motorcycle, and the engine ran rough, with fuel consumption doubling. Getting these small details right makes riding much smoother, especially for bikes that have been sitting idle for a long time.
