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Which spark plugs are installed in the engine?
Got it, those are the correct plugs. Next question, is the engine actually heating up? If you pull the engine cover off and run the boat for a bit, and then touch the top of the cylinder head, is it nice and warm, about 160F, or is it running on the cool side?
Do you have an Infra red temp gun to take the engines actual temperature? (if not, can you get one, they are not terribly expensive)