i'm trying to help my buddy out and finish putting his XR650R in supermoto trim. Here's the carb question Is it a fuel screw or an air screw on the Keihin PE carb? It's got pop on decel suggesting lean but it'll kick over and start with no choke in 40 degree weather. It could easily be lean....I haven't pulled the pilot jet out to look and see what's in it or pulled th eplug yet. but I wanted to know if I am adding air or fuel when I back out the screw.