Alright, i have a 2000 CR125 and the top end power seems to be gone. It used to pull like crazy once it hit the power band but that seems to be gone now that i got it back after getting it rebuilt. I am guessing it is the power valve but i'm not sure why. It starts with 1-2 kicks and idles great. Everything seems to be normal until you start hitting higher revs, then it starts doggin'. Any help would be great.