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xj750 head gasket on a xj650

Discussion in 'XJ Technical Chat' started by sybe, Jul 29, 2016.

  1. sybe

    sybe Active Member

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    A friend of mine offered me his xj750 head gasket to see if i will fit my xj650. His theory is if the heads can swap why not the gaskets. Has anyone tried it? the markings on it is 5G2-11181-10 and i cant find anything online about swapping the gaskets.
     
    sybe, Jul 29, 2016
    #1
  2. k-moe

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

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    By part number it's not the same head gasket ( I think the thickness is different, which will change the compression ratio), but there is more than the head gasket that seals the head to the cylinders. You'll need a cam chain tunnel gasket, the YICS o-rings, and the special-shaped oil feed o-rings. You'll also want to anneal or replace the special-sized copper crush washers that seal the oil-feed to the head (the outer two studs on #4).
     
    Last edited: Jul 29, 2016
    k-moe, Jul 29, 2016
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  3. sybe

    sybe Active Member

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    I already did all that. My funds are low so my friend offered it for free to see if it will work. The only difference between the xj650 and xj750 part number are the first 3 numbers.

    Hoping it will work.
     
    sybe, Jul 29, 2016
    #3
  4. Polock

    Polock Well-Known Member

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    those ain't cheap, it's worth it to lay it on there and look see
     
    Polock, Jul 29, 2016
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    The XJ750 engines have a larger bore, would not recommend............
     
    chacal, Jul 29, 2016
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  6. k-moe

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

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    I knew there was some other difference that I was forgetting. Thanks.
     
    k-moe, Jul 29, 2016
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  7. k-moe

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

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    Those are important numbers. Check out Chacal's post. It won't work.
     
    k-moe, Jul 29, 2016
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  8. MiGhost

    MiGhost Well-Known Member

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    As chacal mentioned the difference in bore size will leave a gap between the head, and cylinder all the way around the bore.
    The correct head gasket is not that expensive.

    ~Ghost
     
    MiGhost, Jul 29, 2016
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  9. sybe

    sybe Active Member

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    ;(
     
    sybe, Jul 29, 2016
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