1957 Scott Atwater 16hp carb settings

Home › Forum › Ask A Member › 1957 Scott Atwater 16hp carb settings

Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • April 20, 2015 at 5:14 pm #1271
    Anonymous

      I just got my Scott Atwater running and would like to know the initial carb settings. It runs, but not for long.

      Thanks in advance,
      Jim

      April 20, 2015 at 5:57 pm #14363
      retiredoz
      Participant

        Depends on which carb you have. If it’s a Carter model N, the initial setting for both needles is approx 3/4 turn open. For the Tillotson MD the settings are 3/4 on the idle mix, and 1 1/2 turns on the main. On the MD, counter-clock rotation on the idle mix screw LEANS the micture..

        April 20, 2015 at 6:15 pm #14365
        Anonymous

          Thanks for the quick response. The carb says Tillotson on the side…I don’t know whether or not it’s an MD. I’m also wondering why counter clockwise leans the mixture.

          Thanks,
          Jim

          April 20, 2015 at 7:23 pm #14373
          retiredoz
          Participant

            Ya got me there ! I just know that’s a (some) Tillotson’s quirk. I suppose it’s a design ‘feature’.

            April 20, 2015 at 9:10 pm #14378
            frankr
            Participant

              US Member

              On most MD Tillotsons, the slow speed needle controls AIR not fuel. Counter-clockwise (opens) lets in more air, making it leaner. Of course there are exceptions. A few had left-hand threads to reverse the effect. A few had long needles that went way in an controlled the fuel.

              April 20, 2015 at 9:44 pm #14380
              RICHARD A. WHITE
              Participant

                Lifetime Member

                I have a ’55 Scott-Atwater 16hp. It has the MD43B carb. Look on the oppisote side where it says Tillotson and the number should be there.
                Ran for the second time just this past weekend. Mine idled very nicely with the top knob turned out 5/8 of a turn from gently closed. I did not get an opportunity to adjust the high speed as I was running on the Tippecanoe River in Montecello Indiana. 5mph speed limit. But just once I opened it up, not all the way, just enough to get her moving… and slid to the middle seat….. GPS said I hit 18.5 and it was still gaining speed before I shut it down…It definitely needs more adjusting at high speed. Hoping for about 25 or so, not sure if I will get it but hey one can hope… I am lucky both impellers are at the lower unit and it pumped water VERY well. Hope this helps.

                Richard

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

                April 21, 2015 at 3:23 am #14416
                Anonymous

                  Thank you all for your help. The top needle on mine is short…so I assume that it’s one that controls air. That explains why opening it causes a lean mix.

                  Thanks,
                  Jim

                • Author
                  Posts
                Viewing 7 posts - 1 through 7 (of 7 total)
                • You must be logged in to reply to this topic.