The speedo's are off by an average of 10%. I have tested 3 bonnies, 2 SM's and a BA. All similar results. My SM seems to be just under 10%. 70mph on the speedo and a gps said 64mph.
I have hit an indicated 120mph on my SM under ideal conditions, no wind, flat road. I have no extras on the bike besides some chrome, no luggage. That was with the SM oem sprockets, not my belt drive, and the shield off. That's probably under 110mph actual speed. That was also while playing with the carbs and the mixture screws turned out almost 4 turns. I normally run at 3 turns as she runs better down low but would only hit an indicated 110mph on the same day (which by the way I have been meaning to ask you guys about).
