Noisy top ends can be caused by a few different things:
excessive valve lash. its an easy fix but remember " a slappy valve is a happy valve".
Secondly a loose camchain can be quite noisy, again usually an easy fix, the xt's have auto cam adjusters that sometimes must be coaxed a little if the bike has mucho miles on it. ( the procedure has been described in several posts here , search the archive)
the loudest noises can come from the cross pin bearings ( connects piston to con rod) when they go bad , its rare but verrrry noisy.
so.. check the easy things first valves, cam chain. Check that you have no air leaks where the carb connects to the head ( spray some wd 40 while the bike idles, if the revs go up you got a leaker).. if its a leaker the lean condition can cause some noises , check plug to verify.
Hope this has been somewhat useful
Best of luck!
Lar
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Laromo \ '02 KTM 300 EXC "Jake"
'05 KTM 640 ADV "Fatman"
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