I bought my 03 WR450 new, about 6 weeks ago. I am very thankful for all the help from TT. The first ride I took the bike on it was bone stock. I was not very impressed. After the help from TT, here is what I have done so far. Air box restricter removed. GTYF Exhaust Plug in pace of stock plug Gray wire removed YZ throttle stop Rejet to 165 MJ, needle moved up one notch Upgrade starter to 04 parts. Acerbis hand guards Acerbis front rotor guard. After the mods - WOW. A completely different bike. I hadn't rode anything with that much power since my KX500. Anyway the bike runs good, better would a JD jetting kit make it run "perfect"? ALso, is the Zip Ty screw everyone talks about replace the screw that is on the underside of the front of the carb? ( the one that takes a 1" long screwdriver) Does the Zip - Ty screw allow for tunring by hand? ALso, would you think that I need a bigger pilot jet? Stock is 45, I see a lot of guys run 48 or 50 sizes. BTW - altitude is less than 1000 feet where I ride. Also, got my police inspection completed and all paperwork in hand, plan on getting plates in the next few days :-) Any other suggestions to do to the bike? Thanks again.