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I would check your spark plugs are not loose, can make a tapperty noise if so. You can quickly check by looking at the tops of the HT leads between the cylinder head and inlet manifold. If any of them are vibrating up and down get it sorted quick. I didn't and stripped the spark plug thread in the cylinder head! Managed to get it helicoiled though.
does it increase with revs bud. i have the same sort of issue and it increases with revs, rev it slowly up to about 2krpm and listen out. mne only does t sometimes though, not all the time.