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Thanks for your thoughts. I use MMO regularly in every gas fill up. I have also used a stethoscope which hasn’t helped much. Things sound pretty normal through the stethoscope when the “clacking” isn’t happening.
The noise seems to be a top end noise, about in the middle of the head.
Good idea to change #2 spark plug which I will try. And I’ll closely inspect the distributor body and rotor contact points.
smurph