My dad had a 93 KDX, man he bought it in 2001 for 700 bucks. It was trashed by some kid who didnt know how to ride and used it only for wheelies up and down the street and hard, hard crashing when he attempted to ride it in the woods. He even rode it for a while with the pipe knocked off of it, yeah he had about 6 brain cells to his name.
Anyway, after a new pipe and some new nuts and bolts and a tranny seal, he rode it right up threw 2005 with no problems execpt for a slipping kickstart (a Kawi trait from this period). An incredibly solid bike, never fouled a plug. The supension was pretty clapped out so in some conditions it kinda bounced around and such, but not too bad.
The engine is absolutely amazing, Beautiful power for the woods. This bike was a bit modified with some porting and I believe an oversized sleeve last time it was rebuilt, well whatever they did to it, it worked. Its not far off of my dad's current 2000 KTM 200 EXC. Hell he actually liked the KDX better then the KTM, he cant get the feel of the KTM and he actually thought the KDX handled better in the nasty stuff!
The KDX 200 is the best value bike in this sport IMO, how can you go wrong?!