I have a 01 WR426 with the bk carb mod, yz cam timing, blue wire and grey wire mod as well as a full system DSP eshaust. It ran fine for the longest time with all the stock carb settings and then all of the sudden it began to back fire really bad and not rev out cleanly. I took off the carb and cleaned it and put it back together and now I cant get it to rev out well. I will set the fuel screw and idle adjust so that while the bike is not moving it appears to run ok. But when I get on and ride it it begans to idle really high and won't drop back down again. If I lower the idle any it just quits. If anyong has any suggestions I would really appreciate it.