Stock 400EX, only thing replaced was the rear brake pads, I got 3 sets so I can change the front at the same time, but they don't need it yet. I still have the 2 new sets of pads that will go with the quad and an extra oil filter.
Runs perfect, never had any problems with it.
I don't ride it very often and need to pay off some bills.
you can see some pic's of it on my myspace page
http://www.myspace.com/wildchilds74