Sohc4.net constantly pontificates that Honda's sohc fours are underpowered electrically. Now I can understand if in your world riding is not done without a full complement of electric clothing on board. It would make sense in that case that you would consider these bikes' charging systems inadequate. But I have missed any mention of electric clothing as part of the whining and carrying on on the forum. It seems the forum experts regard the system inadequate without any unusual electric loading. This is nothing short of incredible. Do these folks really believe riders of these bikes back in the day universally complained of dead batteries? You don't have to be very knowledgeable at all to conclude merely from logic that they did not. Take it from someone who was there. They didn't.

Granted, there are other situations that could result in battery under-charging. Failing charging system parts. Bad wire harnesses (which is now endemic). Infrequent use. Poor maintenance, i.e. corroded connectors and terminals. Chinese batteries and major electrical components. Riding in 5th gear at 30 mph. Even a misadjusted rear brake light switch. That the forum claims a break-even point (though they don't even know how to measure it) of 3,000 rpm speaks powerfully to the case for bad parts. I don't know why that isn't a red flag to them. Putting all of these things aside, there is nothing about these charging systems that intrinsically causes poor charging. They are more than up to the task.

You can tell these folks don't know their stuff because they never describe break-even or discharge, and they do not endorse the best diagnostic techniques. Or adjusting the regulator. The voltage regulator is adjustable on all but the final couple year models of the 750 and the 750 Automatic. All the other bikes, from the 350/400F through the mid-year 750, are adjustable--see below. Just like on your dad's car. And it is covered in the official manual.

Before adjusting the regulator however it is wise to eliminate the things mentioned above, i.e. issues with wires, connectors, switches, etc., Chinese parts, bad parts, and unrealistic expectations. One or more of these is virtually guaranteed to need correcting if observations on the forum are any indication. Only after that should you adjust the regulator. I'm on my second CB500. The first I sold over 40 years ago when it had over 92,000 miles on. That bike, and my current 500 that I have had for more than three years, had/have the regulator adjusted to nearly the maximum output. No negative consequences. No issues whatsoever. Between that and good maintenance and a gel battery, I never have to think about my bike's electrical system. Oh, and I had/have 2-Ohm ignition coils on both of my 500s too. Faultless, invisible, reliable electrics. Don't let the scare-mongers influence you.