Thread: Carb jetting

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  1. #1
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    Carb jetting

    Happy new year BBC, I got my powerhead back together and was rebuilding carbs when I noticed 4 carb main jets are .064 and two are .066. The middle carb has both .064 jets. I am going crazy trying to find where and what jets go in it. My serial number is 0a137330 1985 mariner 2.4 175 hp, carb numbers are 1374-5427/wh-30. The idle jets are .070 and vent jets are missing. When I look up a 1989 carb it shows this set up for jets. Could you please tell me if I have the correct jets for my 1985 and if so what carbs would the .066 jets go in since I mixed them up thinking they would all be the same. I originally had some scoring on #4 cylinder which might not be related. Thanks !

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2
    I believe we've been conversing by email regarding this.


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  3. Member
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    #3
    Yes sir thank you Don

  4. Member
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    #4
    put .066 in it cool pistons down lil
    .................................................. ...the scariest thing in life is the unknown ...................................