I have a old 75 and a 82 15hp evinrude and Johnson. The old one has points and in the winter I run a hotter plug than in summer. The 82 is new to me, it has electric start and doesn't have points. I did put the head off a 92 on my 75 because it needed a thermostat and you gotta pull the head on the old ones. With the head change out I had to get a new cowling because the thermostat is in a different spot. Now 3 holds and the thermostat comes out easy peasy. Wonderful little motors.