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Does the alarm in the boat test beep when you turn the key on?
Great, does the alarm sound when the engine bogs down?
First thing that you should do is a compression test and a spark test using a spark tester. These tools can be rented from about any chain auto parts store. Is this something that you feel that you could do?
Fuel and the fuel delivery.
If any of the sensors were triggering this, the alarm would be sounding. If the cooling system was not functioning correctly, the alarm would be sounding. This could also be carbon inside the engine since you do not open it up all that often. Compression and looking at the spark plug tips will tell us that.
Yes it does. If the plugs are really black, I would also get a can of Mercury's PowerTune. Use it according to the can directions to get the carbon out of the engine.
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