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Lets play... IDENTIFY THIS CARB and if this is correct!

Discussion in 'XJ Technical Chat' started by Lohkie, Mar 10, 2012.

  1. Lohkie

    Lohkie New Member

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    Trying to determine a few things here... first: which set of carbs are these? (mikuni...etc) ; furthermore, I wanted to ask a veteran if these jets are in their correct places? Also, I wanted to know what those two jet-like structures are in the picture with the question mark. Sorry for asking all these questions; it just seems that all of the answers that are relevant to my questions are never accompanied by pictures...

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
    Lohkie, Mar 10, 2012
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  2. mook1al

    mook1al Member

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    They are Hitachi carbs, and the question marks are the air compensator jets.
     
    mook1al, Mar 10, 2012
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  3. mook1al

    mook1al Member

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    Oh, and the other jets are in the correct places and size for a 650
     
    mook1al, Mar 10, 2012
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  4. Lohkie

    Lohkie New Member

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    Hitachi... hmm ok, awesome. Well that helps. Do you know if the jet orientation is correct? I bought this bike about two weeks ago and the previous owner informed me that he had the carbs rebuilt. WELLLL... I never trust anybody I buy bikes from, so I did a new cleaning and put everything back the way it was. Well, I realized that the jets that are on the top of the carburetors are swapped between the cylinders (as in two for two) Carb 1 and 3 have a different arrangement than carb 2 and 4. So I am trying to determine which is the correct orientation to replicate...
     
    Lohkie, Mar 10, 2012
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  5. Lohkie

    Lohkie New Member

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    Also, do those floats look oriented correctly?
     
    Lohkie, Mar 10, 2012
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  6. mook1al

    mook1al Member

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    Actually, the fuel jets are correct. The air jets in pic 3 are reversed....Yep, floats look correct.
     
    mook1al, Mar 10, 2012
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  7. Lohkie

    Lohkie New Member

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    So the air jets in pic 3 are wrong? ... I dont mean to challenge judgement, but are you positive? I know there were some debate about inaccuracies in the haynes manual; so I dont know if I trust it lol.
     
    Lohkie, Mar 10, 2012
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  8. Lohkie

    Lohkie New Member

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    For example, I do not know if Haynes ever revised the issue they had with jet placement on the hitachi carbs. If not, than haynes is still wrong and I will change the other air jets into the position that you say.
     
    Lohkie, Mar 10, 2012
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  9. tskaz

    tskaz Active Member

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    HSC32s looks like to me. And no, Haynes never made revisions, all printed 650/750 Haynes manuals have the incorrect placement.
     
    tskaz, Mar 10, 2012
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  10. Lohkie

    Lohkie New Member

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    So you concur on the incorrect jet placement in pic 3?
     
    Lohkie, Mar 10, 2012
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  11. Lohkie

    Lohkie New Member

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    The only reason I am asking for verification is because the only cylinders that seem to run right are the ones with that orientation (in pic 3)!
     
    Lohkie, Mar 10, 2012
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  12. mook1al

    mook1al Member

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    Sorry, needed to elaborate. The pic is correct in the orientation. The manual is incorrect as Tskaz also noted. I found the same think on my 82 750. When I was taking the carbs apart, I found the air jets were reversed....amongst other hurdles.
     
    mook1al, Mar 10, 2012
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  13. tskaz

    tskaz Active Member

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    Correct. The larger of the 2 sizes (205) is your pilot air jet.

    The smaller size (50) is your main air jet.

    In your pic the jets are located correctly.

    Also, 650's used a 195 pilot air, 750s used a 205 pilot air, suggesting your set of carbs are:

    HSC32 Hitachi model for a Yamaha XJ750.

    Hope we cleared that up.
     
    tskaz, Mar 10, 2012
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  14. Lohkie

    Lohkie New Member

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    Lol... Ok, thanks guys! I appreciate all of the help!
     
    Lohkie, Mar 10, 2012
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