I've been lurking for a while and finally joined -- huge fan of this site.
After biding my time for a while, I finally bought a '75 CB750 a couple of months ago. It ran, albeit rough. Since bringing her home, I've stripped the frame clean and am in the process of cleaning and rebuilding many of the various asseblies.
I'm planning a cafe build (yeah, just like everyone else, it seems), so much of my research comes in that light. I struggled mightily with the decision of whether to keep it all original and do more of a restoration, or do the cafe build I'd intended. A previous owner made my decision easier -- after disassembly, I realized the P.O. had already made some irreversible modifications (like cutting the rear section of the frame to allow for a silly (IMO) solo seat/pillion pad combination). I felt this opened the door for my own modifications (no longer feeling sacrilegious about permanently altering a perfectly good, intact vintage example of an original CB750).
So, with that long-winded introduction, I hope to contribute even one-millionth the amount I've already learned from this site and forum
Cheers!
My photo documentation, thus far:
http://www.flickr.com/photos/34828040@N05/sets/72157615892537535/And some selected photos: