Cant see pic, but a worn camchain would "knock" (more like tapping, sounds a bit like loose valves) at idle, and very low revs, and the sound would go away as you put a load on the engine.
My tensioner was about halfway out at 125.000km, were I replaces it 'cause I had the engine open. You could tell the difference between new and old no problem, but im fairly sure it could have lasted way longer.
Without seeing a pic, og hearing the engine, my bet would be that it isnt the camchain.
You can see if the sound goes away if you install tensioner, and remove the spring. Then use a screwdriver ect and press on the tensioner and see if you can press the tensioner in a click more. Start the bike and see how it sounds.
Be sure to set the tensioner back to normal afterwards.
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