When I had my 79 cb750k, I belonged to "www.cb1100f.net" , it's a site dedicated to the dohc f series bikes, but so much applied to the 750k that it worked well for me.
http://www.cb750c.com. is good for the non supersport DOHC models but if yours is an F DOHC then http://www.cb100F.net is the way to go. Those SOHC Honda forums won't do you much good.I have a '79 CB750L and an '80 CB750F so both these sites are helpful just as this one is for my '82 GL1100.
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