The B12 is supposed to be good for an honest 150-155 mph (240-250 kph). Figuring the optimistic speedo, an indicated 160 or better should be attainable by most.
On my '01 B12S w/Holeshot Stage II, Holeshot 17" street s/o & ZG DB windscreen: Had it >150 indicated several times and just shy of 160 indicated once. (158? Hard to say for sure, didn't spend much time staring at the clocks at that rate.) I probably could have got a little more if I had more nerve... but I started thinking of what could go wrong riding that fast at that location and backed out.
Of course, I'd NEVER do anything like this on a public road.
That would be criminal... and with WA's new speed laws that went into effect last month, anything 31mph or greater over the limit will get your bike/car impounded and get you a stay at the Gray Bar Hotel under the charge of
felony reckless driving.