Reply To: 1966 Johnson MQ-12a service manual

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August 9, 2023 at 3:16 pm #279013
Don
Participant

    US Member

    I’m pretty sure there is supposed to be a spring behind that washer and oring to keep the oring sealed on the needle valve shaft.

    OK, you have had the carburetor off, are you sure you got that crazy linkage back on properly?  Is it possible that the throttle shaft is being held open by the linkage/cam being mis assembled?  If the throttle shaft isn’t closing completely at idle, the engine will cough/spit and stall at low speeds no matter what adjustments  you try to make.