HEy im 15 and i got a 2002 xr 400 and one day i was floating 70mph and then it started to cut out and when i stopped it quit. it took like 5 min to get going again only with full choke and when i shut the choke off it quit so i got it going and drove to school (worked real bad) then quit so i pushed it and i drained my carb just the one bolt on the bottome of the carb 17mm i think and it had water and junk so i wiped it out and went for a ride and it worked awesome so clean the carb