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I have a ploblem with new 750 carbs mystery tube.

Discussion in 'XJ Technical Chat' started by thanh, Sep 10, 2017.

  1. thanh

    thanh New Member

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    Im Thai people apologize for my english.I purchased new engine it come with carbs as you seen in the picture i found 4 brass tube on the top of carbs . I dont know what is this tube and where to connect them ? It look differnce from the other xj bikes in my country no one know about these
     
    thanh, Sep 10, 2017
    #1
  2. thanh

    thanh New Member

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    It look like this.
     

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    thanh, Sep 10, 2017
    #2
  3. Toomanybikes

    Toomanybikes Well-Known Member

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    Welcome Thanh
    Those tubes are vents . A short length of hose goes down past float bowls
    Here is a picture of carbs from my Xj750rl That are the same
     

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    Toomanybikes, Sep 10, 2017
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  4. thanh

    thanh New Member

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    Thank a lot Toomanybikes for all i know from your picture all of hose go to air filter am i right?
     
    thanh, Sep 10, 2017
    #4
  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Incorrect. Those hoses just hang down freely as pictured.
     
    k-moe, Sep 10, 2017
    #5
  6. thanh

    thanh New Member

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    Appreciate k-moe i have a question about this carbs i recently purchased carbs kit they said

    YAMAHA XJ750 Carb Repair Kits
    New Reproduction
    Fit Hitachi HSC32 Carbs
    Qty: 4 repair kits include
    Each kit includes:

    Main Jet #112,#122,#43
    Needle #Y403S

    I am not sure is its fit for my carburetor and why they give me 2 sized of main jet which one is suit for that.
     
    thanh, Sep 10, 2017
    #6
  7. thanh

    thanh New Member

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    Look like this picture.
     

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    thanh, Sep 10, 2017
    #7
  8. thanh

    thanh New Member

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    Last time i read the article call In the church of clean im curious the type of this carb is that HSC32 or HSC33 ?

    Is its right ?
    #102: XJ750E-II models (cylinders #2 & #3)
    #105: XJ750E-II models (cylinders #1 & #4)

    Hitachi HSC33 series (XJ750E-II model)    :
    -Fuel level measured via the clear-tube gauge: 5.0mm +/- 1mm (.197" +/- .039")

    Hitachi HSC33 series (XJ750RL models)    :
    -Fuel level measured via the clear-tube gauge: 1.0mm +/- 1mm (.039" +/- .039")

    And how many turn for idle mixture screw?
     
    thanh, Sep 10, 2017
    #8
  9. Toomanybikes

    Toomanybikes Well-Known Member

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    2-1/2 from lightly seated
     
    Toomanybikes, Sep 10, 2017
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  10. thanh

    thanh New Member

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    Thanx Toomanybikes i will try.
     
    thanh, Sep 12, 2017
    #10

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