For what it's worth...Not saying you do not have a mechanical problem but over the years I have had many bikes, trikes, trucks and cars that have had knocks, ticks, taps and clunks that I stressed over. None of them ever manifested into a problem. Sometimes you will hone in on a particular sound and focus all your attention on it and stress over it. Hope thats all it is for you?
There are bold motorcyclists and old motorcyclists, but (OK) there are few old bold motorcyclists