What's the difference between the throttle of a motorcycle and the throttle?

I only explain nouns, and talk more about other theories!

Throttle-that is, the size of the throttle is often said. Steering carburetor actually refers to the opening of throttle, because the speed of carburetor engine is controlled by controlling intake air. Therefore, the larger the throttle opening, the more intake air and the higher the engine speed.

Air door-full name choke door, used to close the air intake and increase the air intake resistance. Why are you locked in the airway? Because there are many air inlets in the carburetor structure, after the main air inlet is closed, when the engine rotates, it will still be inhaled, but the air can't enter from the main air inlet, but will enter from other holes, and at the same time, more gasoline will be sucked out from these places, which is beneficial to the start of the cold car. So "opening the throttle" is actually closing the air inlet to increase the intake resistance and absorb more gasoline, thus increasing the concentration of mixed steam.