1951 Mercury KG-7

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  • October 29, 2025 at 10:46 am #301040
    Aidan Smith
    Participant

      US Junior Member

      Hello,

      I am new into the Green Top era of Mercs. I have received a KG-7 with a Quicksilver leg and gear case.
      Looking for some care tips, general maintenance, and any additional useful information.

      While it pulls over great and has amazing spark, it seems to pull over hard, like my KF-7. I can’t get several revolutions with one pull, like any other E or J motor.

      Is this an issue with my motors in particular, or just a Mercury thing?
      The KG-7 has the AJ32 carb, and the KF-7 has the AJ29 I believe.

      Thanks!

      "Shells sink, dreams float. Life's good on our boat."
      1931 Johnson A-50
      1950 Mercury KF-7
      1951 Mercury KG-7
      1956 Johnson JW-12R

      October 29, 2025 at 11:08 am #301046
      RICHARD A. WHITE
      Participant

        Lifetime Member

        Nice find…you gonna need a race boat of sorts to run that as I do not think that will run on a 15 inch transom…

        The Mercs of that era do pull over hard, nature of the beast. That is made for a very light race boat with remote steering as you have the steering bar.. that is good… Gearcases are unique, have that checked out, you won’t like the cost to repair one..

        http://www.richardsoutboardtools.com
        classicomctools@gmail.com

        1 user thanked author for this post.
        Aidan Smith
        October 29, 2025 at 11:14 am #301047
        Aidan Smith
        Participant

          US Junior Member

          Thankfully, the gearcase has been gone through and completely resealed.
          It does have the roller bearing, which means disassembly and regreasing after every time.
          I also have a 10′ runabout class hydroplane it will be paired with.
          Any oil recommendations? I was told to run 90wt high performance.

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          "Shells sink, dreams float. Life's good on our boat."
          1931 Johnson A-50
          1950 Mercury KF-7
          1951 Mercury KG-7
          1956 Johnson JW-12R

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