Thanks, Hush.
Pinhead, I'm pretty sure my KZ650 with 4 into 1, velocity stacks, elec ignition, dyna coils, really well tuned, makes more power than a de-restricted cb650. No way would it hit 135.
I don't undersetimate the cb650. I've seen the head design, and noticed how much improved it is over the older cb's.
But look at paulages build. very hot cam, 714cc, headwork, carbs, everything was worked on for that engine. He's gained, maybe, 25 - 30 crank HP. I don't want to get into the heavy math, but I'm guessing 135 - 140 is about as fast as his bike will go. Remember, as I said before, resistance and HP are the only things that determine terminal speed, and resistance increases exponentially, which means the power requirements to go faster also increase exponentially.
As an example, it takes 133hp for a vehicle with 20sqft frontal area to hit 100mph. In order for the vehicle to hit 125, it would require 260 hp.
As I said, exponential.
Or, you can just use the formula for doubling speed. To go twice as fast, due to reistance, requires 8 times the horsepower. i.e if it takes 100 hp to hit 100mph in a given vehicle, it would take 800hp to hit 200mph.