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Your problem sounds like one of two things. Either the engine is getting hot, activating SAFE mode and you just cannot hear the warning horn, if it has been a while since your last cooling system service, I would have that done. The other problem could be that you are running low on gas on the engine. This could be if the boat has been sitting and the fuel system is varnished up. To correct this, you would need to remove and open the vapor separator tank on the side of the engine. Get a good quality carb cleaner and clean out the inside of the VST, and the filter there.