I have a 2001 WR. Boozer gave me all the hot tips, (thanks). So far jetting is stock. I did the grey wire mod, air box lid, throttle stop, seat/tank combo, and pulled the cork out of the end of the exhaust. This thing is a blast to ride, It does have just a little stumble right off the bottom. Next week i am putting on a Power Core 4 exhaust, to see if i can get a little more snap out of it. I will probably go up on the pilot jet one size and the main jet one size and see what happens. By the way, This thing starts 1st or 2nd kick, hot or cold. I will let you know what happens.