Tom Morgan built a national level kx 125 and 250 for me in 99, KX 125's in that vintage were not known to be rocket ships, when he was done they ripped, he did the suyspension as well, and I must say it is as good as we've ever had. The down side was alot of the parts had to be purchased from him, which was not a problem for me but when the bikes were sold it could have been for owners down the road. He also did a flat top piston mod for my 250, by far that was the best mod I'd ever did to a 250.
At the time he did the work for me he was in Lake Havasu AZ, then he went to White Brothers, not sure where he's at now.