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Big bore kit

Discussion in 'XJ Modifications' started by Kevin M Addis, May 27, 2021.

  1. Kevin M Addis

    Kevin M Addis New Member

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    Does anyone know, are big bore kits available? If so, who sells them. For 82 xj750.
     
    Kevin M Addis, May 27, 2021
    #1
  2. Franz

    Franz Well-Known Member

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    Mezzmo Engineering on YouTube. He fitted bigger pistons etc to his project bike.
     
    Last edited: May 27, 2021
    Franz, May 27, 2021
    #2
  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    a company out of canada sells them
     
    XJ550H, May 27, 2021
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  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    XJ550H, May 27, 2021
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  5. Minimutly

    Minimutly Well-Known Member

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    Buy a 900 engine!
     
    Minimutly, May 27, 2021
    #5
    k-moe, Franz and XJ550H like this.
  6. k-moe

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

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    +1
    Swapping a 900 in is less work, and the big bore kit for the 750 leaves the cylinder liners a tad on the thin side IMO.

    Even so, I do get tempted sometimes to build an engine with that kit, or better yet the discontinued kit that came with the cylinders pre-bored for the pistons.
     
    Last edited: May 28, 2021
    k-moe, May 28, 2021
    #6
  7. MikeOxlong

    MikeOxlong New Member

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    Has anyone ordered this exact kit from rcaterink.top? It seems a little sketchy to me that you can get all four pistons, pins, clips, rings, and a head gasket for $65. I've also looked for a description, and there seems to be none...like what size is the overbore.
     
    MikeOxlong, Jun 22, 2021
    #7
  8. 50gary

    50gary Active Member

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    What are differences in the 900cc vs. the 750cc? Most interesting to me is the weight and claimed horsepower of the two motors.
    Cheers, 50gary
     
    50gary, Jun 25, 2021
    #8
  9. Simmy

    Simmy Well-Known Member

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    853 bore 67 stroke 60.5
    Valves 36.1 and 30
    CR 9.6:1

    748 bore 65 stroke 56.4
    Valves 33 and 28
    CR 9.2:1

    carbs 35 Mikuni on 900
    32 Hitachi on 750

    900 has a bigger head with extra cam support so cams are not interchangeable
    I just tore a 650 Turbo and a 900 apart, the transmissions appear the same.

    I’m not clear what changes were made to the 891 that Euro/UK/AUS got -bore increased to 68.5 stroke stayed 60.5
     
    Simmy, Jun 26, 2021
    #9

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