[bobducati]

Since I'm not observant enough to figure this out myself, a friend mentioned that I should check the mono seat/cowl where it wraps around the tail light to see if it's rubbing. Yep....bigger'n Dallas....it was making contact on the left side (as seen from the rear). So I put a plastic spacer....about 1/8" thick to lower the light just a bit. So now I can see some space there and it's not rubbing anymore. It had already rubbed about 1/16" in the tail light and the cowl, so glad I found this. Y'all check yours....may be doing the same.....don't know if this affects biposto's or not.
Another lesson learned as I figure this bike out.