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Top dead center of valve 1 plus 15 degrees. Set it to the mark, verify that both intake and exhaust rocker arms on cylinder 1 are loose, then advance it forward 15 degrees.
At the risk of opening a can of worms, the easiest way to do it is the same as that recommended for a lot of cars.Get someone to push the kickstart down gently, just so resistance is felt.This pulls the chain in the direction of rotation & leaves any slack at the rear of the motor.Undo the adjuster etc & you're done.
When I resurrected my 750F, I found that the plunger for the cam chain tensioner was stuck inside the cylinder. Steel against aluminum + grime...So I took off the entire unit and cleaned it out with the aid of WD40, confirmed that the spring was working etc, then put it back and followed the procedure for adjusting it.Taking off the bottom of the airbox made this job easier.Good luck!
Ahhhhhh.... Ok, that makes sense. Thank you! For other bikes, I've seen it recommended to stick something through the spark plug hole in nr 1 cylinder to determine TDCC- is there another, smarter way for The CB750? And thanks for the help- I'm just not smart on this bike yet. Downloaded the manual today, going to start my homework now!(1978 CB750F)