Classis cam chain/balance chain/valve clearance/clatter noises.
Have you had this engine apart?
Start with valve clearance ( capacity seems to vary, 250 or 400?? ) , cam chain sprung loaded system sometimes needs some help, how do cam sprocket timing lines lie at "T"??, and how much cam chain "lift" from cam sprocket??/link movement??, balance chain adjustment is under clutch cover, again sprung loaded and sometimes needs some "exercise"", see manual for all info.
Do not over tighten these chains!!
Do any noises "disappear" when the clutch is pulled in on handle bar??
If clutch cover is coming off, ideal time to flush out engine internals, clean clutch drum etc, is the clutch drum slotted nut tight?? They can and do cause noises if loose, and clutch basket cush drive "worn"/ carbs out of balance ( thump, thump, thump noise at idle).
Love the tank seam cover, please re route the clutch cable ( repair burnt cable cover with tape and heat shrink )
ps, head exhaust clamps tight and gas leaks?? front pipe clearance for engine ??? looks close, but chain noises defo!!
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