Ticking noise but an unusual one! I need help! Video include

[Artens]

VIDEO OF THE SOUND
https://youtu.be/4y1sudRXe3g

So im lost. Cbr 125 rw7 fuel injected. Done piston ring and head gasket change and cam chain tensioner adjuster to a manual one a few weeks ago. Havent touched or adjusted the valves tho. The sound arrived just in 1 day- straight away. So i took rocker cover off to inspect it. So. What happens is - when the INLET valve is CLOSING, just before it closes it makes a TICK. Doesnt matter how fast the engine runs, the tick noise even appeared when i was turning the engine really slowly. When the engine is at idle - I have few descriptions for that sound - sounds like diesel - or sewing machine. I am studying mechanics but this is just out of my league. Also - rocker arm doesnt seem loose and the tick only happens when the inlet valve closes. ( didint notice power lose.)
Anyway, any help will be appreciated, thank you so much for reading,
Arturas.

[Artens]

Up

[Artens]

Got help from other forum. Everybody ignores here. Meh. If anyone will get same kind of sound and after adjusting valve clearance the sound wont change - it could be weak valve springs that needs replacing - that happened to me..

[yen_powell]

I feel bad now for not typing 'I don't know' when you first posted.

I did wonder if perhaps you were tutting without realising as you were doing it.
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[stevo123]

The valve is thankfully a simple component which always helps! I would look to remove the valve spring and check for crack(s), I can not think of anything else that would make a noise in that area