’67 OMC 80 HP low speed needle; double checking

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  • January 5, 2018 at 12:47 am #8947
    Alan
    Participant

      Hello to all
      Just double checking the service manual on the low speed needle adjustment. I see some contradictory info on the interwebs.
      Model E, type II carb, (fixed high speed jets). ’67 80 HP Speedifour.
      3/4 turns out, from lightly seated?
      Thanks!

      January 5, 2018 at 1:06 am #69268
      frankr
      Participant

        US Member

        Factory service manual sez 3/4 turn. That is only a preliminary setting anyway. Must be adjusted on a boat, on the lake, hood on and warmed up. Idle at 700-750 RPM. Turn needles one at a time toward lean till it loses power or sneezes, then back toward rich till it smooths out. Set final idle speed 600-650 RPM in gear. Impossible to guess the RPM without a tachometer, so do the best you can.

        January 5, 2018 at 2:28 am #69269
        Alan
        Participant

          Many thanks!
          I appreciate the confirmation and specifics.
          It’s tank-tested, and it goes to the lake tomorrow.
          Fingers crossed; hoping third time’s a charm.

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