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    Tuning up early 70s Mercury outboard.....50 or 55hp?

    I am trying to find out for buddy what year and he thinks its a 55hp. Carb needs adjustment or cleaner? We have to replace spark plugs etc. mod # is 557HG serial#4705............early 70s? BBBH
  2. B

    Tuning up early 70s Mercury outboard.....50 or 55hp?

    I am trying to find out for buddy what year and he thinks its a 55hp. Carb needs adjustment or cleaner? We have to replace spark plugs etc. mod # is 557HG serial#4705............early 70s? BBBH
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