The noise may be the cam chain catching on the tensionerbars occasionally. If that does not have the latest CCT, then change it ASAP. If you like, remove the right engine cover and see if you have slack in the cam chain, if so, a sure indication of CCT not having tension. I'd recommend you don't even run the engine, risk of skipping teeth and doing expensive damage.
Got the side cover off. No slack in chain. Would you expect slack in every faulty CCT problem?
Will change the CCT anyway once parts arrive. The existing has no dots on top, blue nor green.
The engine turns fine with a socket wrench on the crank. No bad noises.