Where is the throttle of motorcycle engine?

The throttle of motorcycle engine is installed in the cylinder head, and only four-stroke engines have valves. The following is the specific function of motorcycle engine throttle: 1. Control carburetor flow: control the air flow into carburetor and adjust the concentration of oil-gas mixture. Usually, the lower the position, the higher the position, and the less air enters. When the weather gets cold and the oil and gas concentration decreases, it can be adjusted upwards to change the oil and gas concentration, making the motorcycle easier to start. 2. Conveying oil-gas mixed fuel and discharging waste gas: valves are divided into intake valves and exhaust valves. The function of the intake valve is to draw the air-fuel mixture into the cylinder and compress it. The function of the combustion exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.