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J. F. I wish you were closer would love to help, but...I'm thinking you have something loose vibrating against something else when running.
I'm a big fan on the 3063MC manifold kit langs sells for the intake/exhaust ports, start there and work your way back.
Let us know how you make out with there.
I will add I had an infrequent noise earlier this season and found my hand crank spring worn out and allowing the hand crank to slowly move inward and the crank and handle ends started touching each other.