Vibes increased on Frank as I approached 8000 miles. Main culprit-cupped front Stone. New Avons installed. What buzz remained, was rpm, not speed, related. 2nd culprit, synch time. Better yet. 3rd, sparking plugs. Though I had Iridiums, I had put them in at 1100 miles. Yeah I know, they last forever. Anyway, smoother yet. A reset of the neck bearings brought yet a tad more smoothness. In any case, what I'm saying is that there often is no one major reason for a buzz, but many small, accumulative ones. As the miles roll on, so does the need to address all the little things that make a machine work smoothly, quietly, and oh so powerfully.