I have a problem with fouling. I run 175, 45 pilot, DVP needle in #2 position (which I hastily moved to #1 the hightest clip groove yesterday after fouling at the track). What I've read is that alot of WR's are running the DVP in the 3-5 range. Which would be richer yet then what I am running. The only thing I can think of is the air screw which I have at 1 turn out. Does the air screw have enough impact to cause fouling of plugs? My plug reads rich but my jetting sounds lean except for the airscrew. The bike runs great except for these occasional fouled plugs.