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  1. #1

    Default 1990 90hp force popping sound out the third carb.

    when engine is at an idle the third carb is poppin. goes away when throttle rises and then starts again. Ran some engine tune through the carbs and it didnt change anything. Does anyone know what im talking about. Thanks

  2. #2
    Join Date
    May 2010
    Location
    Sebastian ,Fl
    Posts
    1,755

    Default Re: 1990 90hp force popping sound out the third carb.

    Fill out the profile.Do a compression test.Should close on all 3.Any more than 10% post that.Then reset the air screws.
    In the water, in gear,motor warm.Before you begin,1st turn the air screws in till they just bottom out(GENTLY) then out 1 full turn.Remember what each was set at and if it's way different post that.
    Then reset them,turn each in till it starts to miss.cough,buck then out 1/2 turn.Repeat on the other 2.J
    boats . net worst place to buy parts.
    Get towing insurance.Great investment.
    88 Bayliner with twin 85's

  3. #3
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,184

    Default Re: 1990 90hp force popping sound out the third carb.

    Pull the carb and take a close look at the reed valves.

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