1953 Evinrude 7.5 Fleetwin

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  • May 16, 2020 at 4:13 pm #203241
    w. koll
    Participant

      Recently rebuilt the Tillotson carburetor for the 7.5 Fleetwin. Can’t find guidance for setting the high and low speed needle valves. Evinrude tells the new owner to adjust the needle valves for smooth running after ;the engine is running. That last part is the tough one for me.
      Thanks for any guidance.
      w.koll

      May 16, 2020 at 4:37 pm #203242
      fleetwin
      Participant

        US Member

        I don’t know the initial settings but seem to remember something about the low speed needle actually being more of an air bleed…. So, adjusting is opposite to conventional methods…Turning the needle in/clockwise reduces the amount of air and richens the idle mixture, backing the needle out allows more air and leans the mixture…The high speed needle adjusts in the conventional manor. I’m sure someone will correct me if I am wrong, but something to consider.

        May 16, 2020 at 5:39 pm #203246
        frankr
        Participant

          US MEMBER PAY BY CHECK

          Half right, fleetwin. The slow speed needle adjusts the mixture by varying the amount of air, and yes screwing it in cuts off the air, making it richer or “backwards” but Evinrude reversed “backwards” to “forwards” by putting left hand threads on it. Smart, eh? Normal opening is around 3/4 turn.

          May 17, 2020 at 7:01 am #203259
          fleetwin
          Participant

            US Member

            OK, well that is certainly confusing….

            May 17, 2020 at 10:40 am #203288
            w. koll
            Participant

              Good Morning:
              The high speed needle valve when installed is restricted to about 3/4 turn and Evinrude allows the operator to choose from “1” CCW to “7” to find the smoothest running. Engine runs for about 5-6 seconds and then stalls after that last bit of increased rpm as it uses up whatever fuel was available..

              May 18, 2020 at 9:47 am #203443
              20mercman
              Participant

                The 53 was the last year of the neutral clutch Fleetwin. I have two of these motors, one 50 and a 53. These are decent little motors, but not as smooth as the later Fleetwins in my experience. In my experience, the high speed should be set first on a boat if possible. Then set the low speed. They did have knobs for a reason…..I found that the older they are, the more they need fine adjustments for conditions each time you run them. I never realized the left hand thread. I have two spare carburetors at home, I will look at them tonight.

                Steve

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