It was a warm autumn day, and a great time to have some fun with my son in a dry, freshly harvested bean field. He rode the Z50R, and I took the TC90. A bean field is about as close to desert riding as we get in Indiana. Wide open and fairly smooth, but you have to watch out for the occasional large rock, and mini sink holes from breaks in the field tile.
The TC90 is a sweet running, fun bike.
I got the '75 XS650 enduro out later on. The 21" front wheel does work much better off road than the fat 19" on the '79 XS650 enduro. Where the 19" wants to push, the 21" turns.