I had an '84 Nighthawk 650 as a second bike, very similar engine, not as powerful as the 700S, but more torque, and extremely smooooooth! Should have never sold it.
I always wondered if one could use the 650 (long stroke)crank in the 700(big bore , short stroke), should work out to something line 840cc.
If Honda would have used the same engine architecture and built a 1000cc to 1200 cc version, I would own one now!