Funny you ask ...Mine just started making noises as well. The last ride I went on I noticed it. Does your noise/noises get louder and more pronounced at idle? Mine seems to ...or maybe I can just hear it better.
I think it might have a manual CC tensioner and hopefully can be tightened if need be.
big busa , yes, i only notice it when there is no load on the engine ,
when it is idling , just putting around etc. it doesnt do it constantly ,
it just makes a ticking sound every so often .
Most likely the cam chain. Also check the tensioner pin, and assembly. Pay attention to the guides and sprockets also. Odds are you'll get away with a cam chain. As for how hard, if you have reasonable mechanical aptitude, some decent tools and a Honda shop manual you should be ok.