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    15 HP Sea Horse questions

    Hi All. I just bought a small Aluminum boat with a 15 HP Johnson Sea Horse. Model # is 15R75C which I found to be 1975 on line. I see posts saying a 50/1 oil ratio with Outboard oil rating, is that correct? I did a compression check when I bought and it was 120 PSI on both cylinders with a warm...
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