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R6 (-99) front forks on xj900(-83)

Discussion in 'XJ Modifications' started by Mysk, Apr 22, 2019.

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  1. k-moe

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

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    :)
    That isn't my writeup, nor did I come up with the methodology.
     
    k-moe, Apr 25, 2019
    #21
  2. k-moe

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

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    Ooooo....I might have a need for that.
     
    k-moe, Apr 25, 2019
    #22
  3. Mysk

    Mysk New Member

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    Thank u. Unbalanced as in looking all wierd or as in crappy riding experience?
     
    Mysk, Apr 26, 2019
    #23
  4. Mysk

    Mysk New Member

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    I read that the handling could be a bit tricky with a wider front tire. Any possibility to fit a wider rim in the back. At least as wide to make the handling better.
     
    Mysk, Apr 26, 2019
    #24
  5. a100man

    a100man Well-Known Member

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    ;)
     
    a100man, Apr 26, 2019
    #25
  6. 50gary

    50gary Active Member

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    50gary, Apr 27, 2019
    #26
  7. k-moe

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

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    The thing is, wider tires are no advantage unless the frame geometry (side to side) allows more ground clearance for leaning over further.
    All a wider tire does is allow for a larger radius before you encounter the sidewall (excluding drag tires). You don't get more grip (compounds do that, and there are several modern compound tires available in stock sizes). You don't get a larger contact patch.
     
    k-moe, Apr 27, 2019
    #27
  8. Mysk

    Mysk New Member

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    Not sure I understood all of that:)
    How bad would the handling be if I deside to put a R6 front wheel on and keep the stock rear one. Is it a big no no? I see other bikes with that set up.
     
    Mysk, Apr 28, 2019
    #28
  9. k-moe

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

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    Steering will be slower.
    I see people driving without their seatbelt all the time; doesn't mean that it's a good idea.
    Accident avoidance is the motorcyclist's seatbelt. Slower steering is a not-good thing IMO.

    You are also likely to run into a situation where you can't find the tire you want in both sizes.
     
    k-moe, Apr 28, 2019
    #29
  10. 50gary

    50gary Active Member

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    I would never mix tires, radial in front, bias in rear. I would never have offset wheels front to rear. I would never have a smaller width tire in rear. Slower steering with the wider R6 forks would (in my guess) still be quicker than the stock geometry of the XJ bikes due to much greater rake angle of the stock XJ . The shorter forks without the leading axle and smaller diameter wheel/tire of the R6 will likely de-rake the chassis quite bit yielding quicker steering. I might be tempted to try a bias tire 110/70/17" on the 3.5" wide R6 wheel? With a 130 bias in back. Shaft driven bikes are more difficult to modify for sure.
    Cheers, 50gary
     
    50gary, Apr 28, 2019
    #30
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  11. Mysk

    Mysk New Member

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    Update!

    So I got the forks mounted with the help of All Balls racing (Amazing people over there, just amazing) Next up will be to mount the R6 breaks that just arrived.
    I decided to run the full front from the R6 with rims and wheels
     
    Mysk, Jul 31, 2019
    #31
  12. PavelK313

    PavelK313 Active Member

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    Bearings is the easy part. You will have to worry more about length of steering stem.
     
    PavelK313, Aug 2, 2019
    #32
  13. k-moe

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

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    I'm pretty sure the OP already tackled that part. See the writeup I linked on the first page for how.
     
    k-moe, Aug 2, 2019
    #33
  14. Mysk

    Mysk New Member

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    Yeah. Got it all done with the forks. Not the easiest task but got some propper help:) The original one fitted
     
    Last edited: Aug 3, 2019
    Mysk, Aug 3, 2019
    #34
  15. a100man

    a100man Well-Known Member

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    Come on then - let's see the finished article!
     
    a100man, Aug 8, 2019
    #35
  16. Mysk

    Mysk New Member

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    Yes will do:)
     
    Mysk, Aug 8, 2019
    #36
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