Sorry, didn't get any names LB. Good point Celtfire, if I see such activity again I'll try and get some decent photos if I can before talking to the individuals. Yes Sycamore there where three riders. They had come down the Bowen Ranch Trail, and from other things they said it sounded like they had connected with the Bowen Trail by way of the " trail of least resistance ". When I hiked out that way at the end of the day I saw a number of motorcycle tracks on that trail. When I saw the riders coming down Mo Fo Hill I went over quickly to try and talk with them since I thought that they might go back out of the canyon quickly. Since I needed to watch over my daughters I couldn't stay long with them to talk further about what they were up to. If it happens again I'll try and do a better job of getting descriptions and hopefully some decent digital pictures, and also consider that I would want to proceed in a way that doesn't get me in a confrontation with the illegal riders. Two of the riders appearded to be especially skilled on thier bikes, and with all the time of riding experience it must take to get that good, I would think that they would be aware that you just can go riding where ever you want to, signs or no signs. I seemed to me that they were just playing dumb about the illegality of where they where riding.