I would not take the previous advice to the extreme. DO NOT TAKE THE WATER UP TO THE CARBS! If you cover the battery with water, it will have to be replaced as well as other electronics. Too much chance of other problems. Just fill the bottom of the hull up to the bottom of the engine, you should see the leak. BUT first, just check the seals around the plugs to make sure they are in good condition, and check for cracks in the hull.
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