Johnson A-25 Carb Question??

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  • July 29, 2019 at 8:05 pm #180468
    spike
    Participant

      Would anyone be able to give me some instruction 0n how to properly set the slow speed and choke settings on the A-25 carbs. I have been trying to follow the service manual instructions but I guess I am not understanding what they are trying to tell me. They say to back off the cover screws slightly to be able to make the adjustment .125 (1/8″) for the choke and .156 (5/32″) for slow speed.
      Sounds simple enough, but I guess I to am simple, can’t seem to get what they are telling me to do. Any help?

      July 29, 2019 at 9:28 pm #180473
      lyks2tinkr
      Participant

        US Member

        It’s been awhile since I did one but the 1/8 they are referring to is how much the carb throat should be open at choke. You can use a 1/8 drill bit as a gauge.
        You can use a 5/32 drill bit as a gauge for the low speed opening.

        July 31, 2019 at 12:02 pm #180557
        spike
        Participant

          Thanks Tinker, I Got It! Sat down and had a cool one, thought about it a little and yes it was simple. Found a couple of steel rods the correct dia. for both settings and cut them into 4″ lengths and made a couple of gauges. All set for the next one!

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