I just got back from two weeks in the Sierra Tarahumahara. Nobody rode a BMW on this trip, but a lot of us are BMW riders. Rather than cut and paste, the easiest way to view it is to follow the thread on KLR650.net.

http://www.klr650.net/forums/showthread.php?t=37827

I think guests on the forum can read the thread, but there is an outside chance you will have to register.