HELP. Been checking out the post for over an hour now and cannot find a similar problem. My 2002 Wr426 with 2000 miles (airbox lid removed, two step leaner jet needle, #158 main, 1/2 turn in pilot screw, stock muffler baffle removed, and grey wire still connected) will sometimes run terrible, I am talking backfiring, bogging when I open the throttle, poor starting, not accepting full throttle, etc. It seems to happen for about 10 minutes then it runs like a champ!!! It happens at different altitudes (I ride from 4,000-10,000 ft) and different times (on a cold engine and after a long ride). I've cleaned the carb several times. An Item of note is the CDI unit was replaced under warrenty about 1.5 years ago when my WR wouldn't accept anything above 1/4 throttle (that was a long ride home) and it ran so hot it browned the muffler and boiled the overflow tank. I'd ride it for three minutes and let it cool for 10 minutes. Since the CDI replacement no more overheating, but this temporary poor running has started. Any help you all can give would be greatly appreciated. Thanks!