I have several irons hot, a 1947 Johnson HD-25, 1955 Johnson CD -12, 1946 Evinrude Sportsman 4409, 1952 Evinrude Sportwin 3012, A newer1974 Evinrude 4306, A 1946 Mercury KD-4 Rocket, and what I think is a Neptune Model 700, or a Mighty Mite 3. It seems like allot to have going at one time , but they are, for the most part , all together. I do the maintenance, [points, plugs, impeller , ect. ] as soon as I can, after purchase . I label anything outstanding with a sharpie on a piece of tape, and reassemble. Put them in a tank and make sure they run and adjust the settings. Then I tear them down one or two at a time , strip and paint, and address the outstanding issues. While the paint is curing or I am waiting on parts , I start on another.