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XJ550 Mikuni BS28 Pilot Screws

Discussion in 'XJ Technical Chat' started by j_ham, Jul 12, 2023.

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  1. j_ham

    j_ham Member

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    Hey everyone.

    I'm trying to get my '82 XJ550 Maxim carbs tuned up, and I've run into a bit of an issue with the pilot screws/idle mixture screws. I've ordered some new ones from several places and they don't seem to fit right. The (what I assume to be) original screws I pulled from my carbs have a shorter "shaft" and more threads engagement when fully seated. The new ones have a longer shaft and less thread engagement. This makes it so that with the new ones I cannot start them off at the recommended 2.5 turns out; they only get about 1.5 turns out before the threads disengage. Is there a way to make these new ones work? Or is there a place to buy new screws that actually fit these Mikuni BS28 carbs?

    Image so y'all can see what I'm talking about:
    image_67233281.JPG
     
    j_ham, Jul 12, 2023
    #1
  2. Huntchuks

    Huntchuks Well-Known Member

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    Start a conversation with Chacal. Click on the XJ4Ever logo at top right of this page to look for the correct items.
     
    Huntchuks, Jul 13, 2023
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  3. tabaka45

    tabaka45 Well-Known Member

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    Yep. He will get you the correct screws. What was wrong with the original screws?
     
    tabaka45, Jul 13, 2023
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  4. j_ham

    j_ham Member

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    Well, I really just need one, I guess. Was missing in carb #1 when I bought the bike.
     
    j_ham, Jul 13, 2023
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  5. j_ham

    j_ham Member

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    An update for the sake of completeness on this thread and for anybody that happens to have this problem in the future:

    Neither of those screws in the original posting were correct. They are both course thread; the Mikunis should have a fine thread. The correct screws are the same length and size as the larger ones in the original pic, but with finer threads.
     
    j_ham, Aug 3, 2023
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