Just bought a Sea Ray 90 hours on it. Engine runs good but every once in so often we hear a loud bang when the engine is running down the lake. Sometimes will go for a couple of minutes and then quit or hear it once or twice and then not for an hour or so. Any ideas what that could be. Might not hear for hours and then here we go again. It is a 27 ft sea ray that looks like brand new (2005 year). Almost sounds like a backfire with a big tin sounding noise.
