Jwproffitt

Cacrwlr, I apologize. The pilot screw is just outside of the carb bowl toward the front of the atv. I for it mixed up with one of the other ones. You do have to turn the carb to adjust it though. It's a pain. 

The pilot screw is located inside the bowl of the carb.  I think the one that you are describing which is located on the underside of the carb is the screw that you use to drain the gas out of the bowl. You have to loosen and turn the carb to remove the bowl to adjust it.