The throttle cable of motorcycle vacuum film carburetor controls the size of choke valve.

How to control the throttle size of motorcycle vacuum film carburetor throttle line? The throttle size of the throttle line of motorcycle vacuum film carburetor is controlled by turning the throttle. The throttle line is installed at the left spring position. Turning the throttle will change the size of the choke valve in the middle of the outlet. The screw with spring on the left is the idle speed adjusting bolt. Choosing downward will make the choke valve open wider, that is, the idle speed will increase. There are four small holes under the circular choke in the middle of the outlet, which are auxiliary idle oil holes, and the larger hole on the left is also the main idle oil hole. When the choke valve is completely closed, the auxiliary idle oil hole is completely blocked. At this time, only the main idle oil hole supplies oil. The greater the idle speed of the adjusting idle bolt, the more the auxiliary idle oil hole is exposed. There is an idle air hole on the right side of the air outlet to supply air at full speed. This hole is also used as the outlet of the enriched gas mixture of the enrichment device when the cold car is started.