this issue is well covered in different posts.there are 3 possibilities for the source of the sound, without excluding something i still havent thought of.chain and sprockets,cam chain ,hydraulic oil pump chain.freagin chains...
---sooo,the chain and sprockets last about lets say 20 k miles in average with good maintenance ? maybe more
---oil pump chain doesnt have a tensioner so its the most possible cause of this sound.it is suggested to be changed more often by a kawi mechanic on some post,i cant find it atm.he mentioned to be changed every 15k miles
---cam chain has a tensioner so its not so possible to be the cause.however cam tensioners are always a cause of troubles for kawi so it needs to be checked.the periodic valve check should also be a good time to check the chain for slack,etc.people in this forum found the valves tighter(exhaust) than the spec in less miles than it should.
in my experience ,yes i hear the clicking sound also,it mast be the oil pump chain cause i spot the sound just where the pump is supposed to be.in any case every engine is a unique case so it needs further investigation.dont take anything for granted.