Just unpacked my old Sea Horse that I put in storage back in 1975 and need to get it running for an upcomming trip. Back then it ran great and looks almost like new. What should I do as far as maintenance. Change plugs anything else. It has good compression. Also would like to find out what year it is. I had bought it used in 1973. It is a Johnson Sea Horse 5.5HP Model CD12 S/N 1319819. All help is appreciated. Thanks