That can't be right. Even with the standard, extremely tall, gearing on my 750SS I'm lucky to see an indicated 140mph flat out downhill with the wind behind me. By then its just touching the redline too.
I normally run with 1 less tooth on the front so it now tops out about 130mph at the redline but it can actually get there without a big hill.
The standard speedo is definitely flattering on an SS. My 900 used to see 150+ on a regular basis, with dynojet K&N and cans. The previous owner had done some work for MCN and had recorded a run through the lights at bruntingthorpe one day at 135.
So up to 10% of generosity backs up twpd's comments.
Must check my 916 against my mate's ex-plod Pan to see how it measures up.