All dampers are closed.

This should start with the difference between the throttle structure, working principle, official name and common name of this carburetor.

The throttle of this carburetor is actually equivalent to a flap. When the left hand turns the throttle wrench on the switch to the left (that is, in the direction indicated by the arrow), the handle on the carburetor will be lifted, and the "flap" at the throat of the carburetor will be erected, thus closing (blocking) the air from the carburetor. With the decrease of air intake, the gasoline in the mixture ratio will become more (thicker), which is beneficial to engine cooling. In this state, the air from the carburetor is closed and enters the throat, so the correct name is "closing the choke valve", which is what we usually call "the damper". However, due to our daily slip of the tongue, opening a device is called "opening", so the "air door" in many people has changed from the official name of "closing the air door" to "opening the air door". You just need to remember to pull the damper handle to the left when the car is cold or difficult to start. The engine needs rich mixture when it is cold, and only needs lean mixture when it is warm. Too rich mixture will cause insufficient combustion, but will cause flameout. Therefore, after starting the warm-up for a period of time and the engine runs smoothly, the throttle handle should be pulled back to the right side in time. At this time, the carburetor provides the engine with an appropriate concentration of mixed gas, and the motorcycle is in a normal running state. In other words, if you don't pull the damper to the left when it is cold, it is difficult to start or turn off when it is idling. If the shock absorber is not pulled to the right when it is hot, it will cause driving weakness, fuel consumption and even flameout.