Hello all.
I suspect that the upper and lower crankcases of my engine (CB750 K0 according to serial #) don't belong to the same engine, I mean, that someone used the upper and lower crankcases to assemble this engine. I searched for any marks to confirm if they belong to the same engine, and I found "Q128" stamped on both crankcases. Is that a Honda mark or someone made them? Does it confirm that they belong to the same engine?
