Where is the throttle valve located on a motorcycle engine?

[VonNevaeh]

The throttle valve of a motorcycle engine is installed inside the cylinder head, and only four-stroke engines have valves. Below are the specific functions of the throttle valve in a motorcycle engine: 1. Control carburetor flow: It regulates the amount of air entering the carburetor to adjust the concentration of the air-fuel mixture. Typically located at the lowest position, the higher the position, the less air enters. When the weather turns cold, the air-fuel mixture concentration decreases, and it can be adjusted upward to change the mixture concentration, making the motorcycle easier to start. 2. Deliver air-fuel mixture and exhaust gases: The valves are divided into intake and exhaust valves. The intake valve's role is to draw the air-fuel mixture into the cylinder for compression and combustion, while the exhaust valve's function is to expel the burned exhaust gases and dissipate heat.