Tom,
I hope you're not pissed at me for being the first to question you. I think everyone here is just having a little bit of fun... nothing harmful is meant by the ribbing, as ofreen also stated.
May I suggest taking a step back and looking at this as, instead of being the one who posted, imagine being someone who is just reading a claim of someone taking a CB550 up to those high speeds. I think if you do this, you may realize that we have valid reasoning to doubt the mph claim you make.
Look at it this way... remember a while back the MN idiot who was clocked by an aerial cop of doing 205mph on his RC51? How many people actually believed that? Only the people who don't know jack about bikes. Hell, Miguel Duhamel could only hit 190 or so on his FACTORY RC51 at Brainerd, the track with the longest straight on any race course in the US. I'm sorry if it upsets you, but to me, but 155-165 on a 30 year old, air-cooled 550, race prepped even, just sounds a bit, ummm, optimistic. Hell, then consider whether or not the tires could stand up to those speeds, because I don't know of many z-rated tires that would fit a 550, stock sizes anyway.
I, and I'm sure others here, would love to be proven wrong, not with claims, but with fact. A speedometer unfortunately is not fact.
Again, I'm sorry if I upset you. We're just a group of interested people who are having a bit of fun.
Jeff