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Alrighty - compared the #s: looks like I have a 1978 CB750F3...with a 1981 CB750C identity plate slapped on the frame. My frame and engine serial numbers seem to be aligned to the '78 CB750F3. I think I'm in good shape. I'm not going to try to unwind the registration issue unless my DMV...

I got a chance to clean and do a little more inspection. Here's the stamp on the left side of the frame head tube: and here's the engine stamp: Was there really a CB750E ? Do I have a very strange compilation of bike parts?

Hey folks - thanks for all the great info and suggestions! Hopefully I can get to more investigation this weekend. As I mentioned, this project is going to take a while given my availability. And, what a great resource this forum is - thanks again!

Weird, right? Has anyone tried to drop an SOHC motor into a newer frame? I'm new to this, so unsure of compatibilities. The bike seems to have newer components, e.g. triple brake discs. I guess I can take the motor serial # and somehow use that to get the correct motor parts. This will be a...

Here are the bits of photo evidence: As SOHC motor, correct?

Hey folks - I just inherited a 1981 CB750C (as identified on the steering head tube). It has a SOHC motor. I'm confused. Can someone help me understand what I've inherited? I thought all CB750 bikes > '79 were DOHC models? Thanks in-advance for any advice; happy to attach some pics to further...