If you get one stick to light offroading, the later ones have a real problem with the wheels coming apart. A buddy of mine had a new '97 model when we were in high school, and I had a KLR 250. Well we went riding on some horse trails one Saturday, and by the end of the day his rear tire was flat because the wheel disintegrated and punctured the tube.
When he took it to the shop to have it fixed, they told him it was a common problem with those.
'79 xs650 Special
'80 kz440 B1