Well, after I posted this last night, it started bugging me. Off the the garage I go. I took the exhaust
bolt out (behind the headpipe, in front of the silencer), and put a spacer between the pipe and the frame, maybe a little thicker than a nickel. This moved the pipe towards the center of the bike, and off of the reservior. I got to thinking about it, and there must have been a spacer there before, but that bolt fell out on the trail a while ago, and I didn't even think of a spacer when I put in a new bolt.
Anyway, all better now!