Re: 1969 Potter
juris - Merc made a 220 in the late 80's and a 225 in 80 - 81. I don't think they made the 225 again until 1994.
If you have the externally mounted Trim and Tilt pump then you have a 1980 or 1981 225 blackmax. Check the compression and lowerunit for milky gear oil (standard stuff). . . also the coils, wiring, etc.
If you have a chance post a few pictures.
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