A buddy of mine are doing the old "666" now 191 this weekend and rolling through Flagstaff. Here's a pic of the route (there are a couple of minor errors on it, but I used a free map editor so I can't bitch).
Great riding area. I once pushed my 1948 panhead from 1/2 way between Hayden to Globe because I broke the primary belt. What a frigging hot push up and down those mountains. Then I rented a room at the Hank Williams motel and took the bike back to Tucson in a rental truck.