That always used to crack me up when a friend would get a new 80, his hardley riding dad would want to ride it. Kids would always say "careful dad, it has a lotta power", dad would always say " I ride hardleys, this thing won't have any power compared to that". Always ended up with the kid's rear fender aimed skyward, dad scraped and bruised up from looping it out!
Fastest I've been (only once or twice cause my friends took off on a clear stretch) was 155 on the speedo, pegged and not gaining anymore, but that's probably more like 145 corrected. On the track I consistently hit 130ish.
And ffc, I can't remember exactly which bike you said you got (600 rebel?), but if you say 600rx you're gonna have people thinking you mean xr600. With hondas you usually ignore the letters after the #, it's the letters before that are the model.