My '99 WR400 runs great, no bog, plug looks good, starts easy etc.. But I would like to find a way of getting a litte more snap/crispness when I'm at low RPM's and I goose it in 3rd or 4th. Right now the power kind of rolls on. It takes about as much time to get in the power band as if I were feathering the clutch. I'm running a White Bros. E2, my jetting is; 170 main 45 pilot 60 starter 200 main air 75 pilot air 90 slow air This is the set-up the bike came with except I changed from a White Bros E series to the E2. I didn't notice a change in performance when I switched exhaust so I figure the jetting was ok. It's pretty much run like this since I've owned it so I don't know if this is just how they run or if somethings amiss.