Why does Haojue New Yuexing throttle screw control gasoline pump?

The right hand controls the throttle and plays a role in flow. The function of idle screw (throttle screw) is very simple, that is, jacking up and putting down the throttle, and controlling the throttle with the right hand to play the role of flow. The function of gasoline pump is to suck gasoline out of the fuel tank and send it to the float chamber of carburetor through pipeline and gasoline filter.