Don't know if you remember but I did a ride report about a ride on my CB 1100 down the Blue Ridge Parkway with a buddy on his 1200 Sportster. We switched bikes on the Blue Ridge and when we traded back he said the exact same thing..the only thing his 1200 Sportster and my CB1100 had in common was that they were both motorcycles. The CB 1100 was superior in every way.
That is exactly how I would describe the Nighthawk 750 as well. It's one of the easiest bikes to ride, or work on, but you never have to work on them lol. No epa crap in the way. 1 vent hose you have to drain fairly often down by the right footpeg I believe. Black vent cap on a clear hose. Collects evaporative overflow. Hard to get the cap off without getting the stuff on your hands, be forwarned. Air cleaner is a snap to get to and replace. Battery is easy to get to as well. Plugs easy to get to. Oil drain plug and filter easy to get to. Easy to bleed and replace front brake fluid. Easy to hit painted parts with some spray polish or pledge and make it all shiny.
The CB 1100 is a lot like the Nighthawk, only with more power and better brakes...and you have to adjust the valves lol
The 16 tooth mod is a common and easy one and the sprocket is readily available. I think I got mine at Sprocket Specialties. I thought I had a new one out in the garage, but I just looked and it's not there...I must have given it to the gentleman that bought my Nighthawk. Anyway they are about $20 or so and will drop the rpms about 400 at any given speed. The caveat is, I thought I wanted to drop my rpms as well, but for back roads riding the 15 tooth sprocket just makes more sense. Easier to pull out of corners in 5 th without having to downshift. On a lot of Kentucky backroads ( and I know because I ride a lot of them) getting into 5 th and just using engine braking to slow and throttle to pull yourself out is like riding an automatic. Just ride, not much to do except enjoy the scenery....and Kentucky is a beautiful state to ride in. So I bought the sprocket, but I never put it on.
Glad to hear you are happy with your bike.