I don't think my boat's engine is running at top notch and it is a old engine, 70's or so, but one of my friends said he heard from a mechanic that if the carbs might be dirty because I have been going through so many spark plugs and lacking power when others are in the boat. He said to get a entire can of carb cleaner and spray the whole can into the carb. Then let it sit over night. Then when you start it up it will smoke for the first couple of moments but it will brun and clean up everything in it. Has anyone heard of this or done that?