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  1. #1
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    1985 175hp 2.4L V6 Black Max

    Does anyone know the main, and idle jet sizes for the WH-30 carburetors on this outboard. I had engine failure on cylinder #4. I and was told it was running lean by a few people I talked to about it. The carburetors were supposedly rebuilt right before I bought the boat. I am wanting to make sure it has the right size jets in the carbs, and make sure they were installed in the right places. My manual does not have the WH-30 in it. I spoke to Mercury yesterday, and they could not find it in their manuals either. I have looked all over the internet and have not found any info.

    Outboard serial number is 0A136903.
    Other numbers stamped on the carbs is 157-155, 1374-5427, 1374-7561

    This is the jet sizes installed now, looking at the front of the carbs, from top to bottom carb:

    Carb#1 - Left: .080 - Right: .064
    Carb#2 - Left: .064 - Right: .064
    Carb#3 - Left: .066 - Right: .064

    All 6 idle jets are .070

    Thanks for any help with this!
    Last edited by Fisher77; 05-05-2016 at 12:25 PM.

  2. #2
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    Found out today it was manufactured in 1985. Dont know if that will help.

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