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Thread: Carb help

  1. #1

    Default Carb help

    I am trying to get a 1938 Johnson 1.1 hp motor to run. Good compression, clean tank, good fire. It will run briefly then dies. I think it is starved for gas. Have carb apart and cleaned. Re-coated cork float. My question is on the needle valve. How far should you have it opened from a seated position? Looks as if someone has had it apart before.

  2. #2
    Join Date
    Dec 2015
    Location
    maplevalley WA
    Posts
    3,544

    Default Re: Carb help

    Does the needle have a nice smooth taper? Start wit 1 1/2 turns out and adjust it from there once the engine is fully warmed up. Turn it 1/8 turn at a time and wait about five seconds between adjustments. Turn it in until the engine coughs and then back out 1/4-1/2 turn. Best to run it rich to protect the motor

  3. #3

    Default Re: Carb help

    Sounds good, I will try it. The needle is in good shape.

  4. #4

    Default Re: Carb help

    Took carb all apart again and cleaned good. Back together but still just runs for just a few seconds and dies. I have tried moving needle to several different positions up to the point that spark plug comes out wet. Still just fires briefly then dies. Any suggestions?

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