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Message: <blockquote data-quote="thill" data-source="post: 521405" data-attributes="member: 4972">Did you ever drain the bowls of the carbs?   A little water sitting in the bottom of a bowl can cause some big headaches.I would look at the carbs and fuel system carefully, as fuel starvation in one carb can destroy the engine.  Spark issues generally won't hurt the engine, it just won't run well.Pull the carbs and clean them out carefully and put in new gaskets, not screwing the bowls on too tightly, as that warps them.   You might want to add a healthy dose of SeaFoam.  You can't add too much.  2 oz./gallon is a good treatment dose, and will sometimes clear up some problems.  But you need to run the boat several times after treating so that it will work.I hope you get it figured out.</blockquote>