mix ratios

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  • March 18, 2018 at 12:46 pm #9440
    oldfart
    Participant

      Hello,
      I recently acquired some old motors from a farm sale. Both are in relatively good condition and both have spark when cranked over. I would like to try getting them started. The first motor from what I can deduce from the serial number is a 1970 Evinrude 25hp with electric start. The second is a Mercury Mark 55. What would be the correct fuel to oil mix ratio for each motor?

      Thank you,
      Carl

      March 18, 2018 at 2:20 pm #72656
      Mumbles
      Participant

        The Evinrude would require 50:1 but I’m not sure about the Merc.

        March 18, 2018 at 2:34 pm #72658
        dave-bernard
        Participant

          US Member

          merc can use 50-1 I would use a little richer maybe 40-1 originally before 50-1 oil came out it used 25’1 merc then recommended there 50-1 when it came out in the mid 60’s.

          March 18, 2018 at 7:29 pm #72678
          oldfart
          Participant

            Much obliged fellas!

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