George,
Glad to hear the Bimota got sorted. To me, that plug looks a bit rich, but not bad, could be a symptom of the bike not running properly.
what does the other plug look like? Is that the horizontal or vertical(rear) cylinder?
I just changed mine and the rear was a bit lean compared to the front, which is typical as the rear cylinder has less airflow (on the air cooled bikes of course) and runs hotter. I may need to balance the throttle bodies or adjust the fuel to get the mix equalized on both cylinders.
If she is running better now, I'd throw new plugs in and put a few miles on it. Pull them again and recheck/compare.
Just my 2¢