good evening all. 1st post here. i have 3 trikes 83/84/85 atc200's. i was wondering if the adjusting screw on the bottom of the carb is an air or a fuel screw. the manual i have says its a pilot adjustment screw, but others refer to it as an air screw. does this screw adjust air or fuel levels. does turning the screw out richen it or lean it out? thanks