Originally Posted by dpetryk

Here is the adjustment. - You move it inward to increase the idle speed and pull it out to reduce the idle speed. When moving it make small movements. I use a flat tip screwdriver to pry between the nut and the housing to pull it out. I use a vise to push it in. The screw is a 10-32. It is not the right thread but it will hold. I do not screw it too tight for fear of trashing the threads inside the brass thing in the valve. I just make it hand tight but be sure it is seated. I could not find the proper screw to fit it. The 10-32 works great for me. Remember just small adjustments.