^ From what I understand they are both fairly bullet proof and solid motors but obviously the power valve system on the kx's will net more bottom end and a smoother transition onto the pipe. I think the kx's were more popular with the desert type racers vs the cr's any many titles were won
I have heard that the kx's vibrate more than the cr's, can't remember why though?
When I was on the hunt I was looking for both, my only criteria was price and year. I wanted something in the 89-94 year range. Seen lots of great looking kx's and almost always at better prices than the cr's (cult following type thing I guess) but never the right year or the price and distance was just not that appealing.
I kind of wanted the kx for the PVS but with the cr it is nice to have one less thing to worry about
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I love the smell of burning pre-mix in the morning
I don't think I'm a lot dumber than you thought that I think that I thought I was once.