Sounds about right, not sure what you are expecting for a 1986 bike.... I owned an 86, and sold it with 138k miles on it in 2009, and it was probably the best running Silverdammit bike in COG at the time...
Flogging an '86 isn't wise, it is what it is, its meant to be ridden a long time, for many miles, and when in a perfect state of tune will perform great, just don't hover above 7k rpm.... run it up there and shift... you have 6 gears, use them... but I'll also say don't ride around at 40mph in sixth gear either... the bike loves the 4500-6000 rpm range, and that's its happy zone, I regularly hit the zones you speak of, in twisties and such, but its on and off throttle cycling on a bike I did the tuning on...
As for top speed, in its OEM configuration, it will see about 135-138 mph max.. just letting you know...and that's pushing it, and should not be done for long distances, or on a regular basis.