GS450E Engine noise click/slap diagnostics

[Guest]

What is causing this noise ?

https://youtu.be/bJui4mc8KhI

1981 GS450E ,9000miles on it

My initial thought was loose cam chain so I took the valve head cover off:
- I check valve clearances & re-shimmed now all valve clearances are within spec(.03-.08mm) except for my RIGHT LOBE EX SHIM which is at (.102mm) which is fine .

- i removed the cam chain tensioner & reset the tensioner then reinstalled back onto engine block at TDC. Backed out the stop screw 1/4 turn then locked nut, confirmed tensioner is functional .

- cam chain timing is perfect and there are 18pins between the 3^ and ^2 arrows.

- the cam chain is is good condition not too worn or too much play. The guides are all in good shape

so I am stumped what is this noise and how do I fix it? Thank you. This is the 5th vintage bike I've restored and I'm stumped .

[Nessism]

Hard to tell from that video. Doesn't sound too bad to me.

[azr]

I can hear the higher pitch tapping noise that you're probably worried about but doesn't sound unusual.

[Alexxxx]

Thanks guys, yeah its almost a light slap sound but It could just the way the engine is supposed to sound.

[Alexxxx]

I can take another video, how would you suggest I video differently so you can hear better?