I'm trying to get some information about this West Bend outboard. My uncle pulled it out of the basement after who knows how many years. We've tested it out and it still runs, but I'd like to know what years this model was made, and other basic questions like the proper oil to gas mixture (can I use unleaded gasoline??). Is it air cooled (there is a tube at the bottom by the prop, but we are not sure what it is for)? Any information would be appreciated, including suggestions on how one would go about selling it.