Hey Fellow MNers,
You are in luck; There is a suspension guy in Coon Rapids, MN, and he does very good work. He's done mine, my son's, and buds, and we were all happy with the results. He can supply the forks, parts, etc, whatever you will need to get your KDX working for you.
He goes by the nickname Shocknut, at
www.trakcontrol.com I'm not sure if his website's mail is working, so you may want to search him on this board and pick off his email. Tell him I sent you and good luck with your suspension tuning.