Ok I have tried so many things to get my 03 wr450 to run right I am going to light it on fire soon! The bike runs great low end mid range and then it stutters on top end....I have re jetted the bike I have even changed the jets in the feild to see if I could get the right one in still stuuters! Things I have done, I have taken the carb off cleaned it up I also put the JD kit in( used many different jets the JETTING is not the problem! I have replaced the plug, I have replaced the air filter, I have ran the bike with out the tps, I have checked for vaccum leaks. The one thing that was interesting to me is when I was checking the valves I noticed that the ounch marks in the cams was off...One cam on the intake side was one tooth off? I brought the cam back to the original specs and thought I had found the problem but still stutters! Could it be the ignition coil? could it be the cdi? What the hell is going on? Oh one more thing the grey wire mod was done so I plugged it back in and still stutters. I want to avoid the dealer but it looks like thats where it is headed:banghead: If you guys can think of anything else please let me know what I can do. This happened from one minute to the next it was running good and then all the sudden bam it started missing......PLEASE HELP!