I have a 2000 Wr and have a flat spot or delay when you give it a quick wick of the throttle, I have Tryed to richen the main jet, I have tryed to lean out the main jet, I have tryed to raise the needle and lower the needle and nothing seems to cure the problem. The excel pump works great. The timng is stock it has a stock pipe. Is this normal with this bike I haven't heard of this problem before so that is why I am asking. Is it maybe because of the exhaust cam timing on the wr?