Thanks for the comments on the 1983 XL600R.
I just purchased it in September of 2013 I am the third owner. It was originally purchased in 1984 in Roswell New Mexico and apparently the original owner never rode it more than 500 miles. The second owner was a friend of the original owner and he basically did some regular maintenance and rode it about 1000 miles.
It is all original and only has 2500 miles on it. I am still impressed that it is now 31 years old and has original paint that looks great for being a dirt bike.
What I really like about the bike is the engineering involved. It has an oil tank that is the frame, it has a mono pro link shock, 4 valve engine, 2 headers, 2 carburetors one high speed and one low speed, 2 compression releases, and stock air bleed screws on the forks.
Every time I take it for a ride it makes me feel like I am doing the Baja 1000 which has always been a dream of mine.