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Message: [QUOTE="griffbones, post: 1103260, member: 72285"] I talked to Eric Gorr yesterday, and he also thinks this bike most deffinetly has a lean stumble, but he is not sure why. He doesn't think that I have a vacuum leak because it returns to idle ok and it has been this way for two months and has not yet siezed, and my plug looks tan. I told him that raising the needle didn't help and neither did going up one size on the pilot, so he suggested that I try a one step richer throttle valve. It just seems strange that I am having this problem when other KX's don't seem to have this issue, and our old 2003 didn't have this problem either, it ran great! BTW- Sudco wants over $65 for a throttle valve that I am not even sure will help. :( [/QUOTE]