the headlight is a 12volt bulb, i don't know what size originally came on them but it has a 7 inch bucket on it with a sylvania 12 volt sealed beam bulb.
but no regulators were changed, I'll have to take a look at it, perhaps I can rewire it like the newer bikes with a rectifier/regulator like you did. I'll give it a shot.
oh I do have to point out that bulbs kept popping at hire rpms so I hooked up the headlight to the battery. It still gets brighter at higher rpms so I know it is charging the battery, so... I'll i'd have to do is have a 12v rectifier for the charging of the battery and done, would that sound correct? and I should be getting one at the end of the week, off of a 85 cb650. getting that for parts for the 71 cb750.