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Help ZXR250 internals strength.

Discussion in 'Kawasaki 250cc In-line 4's' started by Bryn duFresne-Mann, May 25, 2016.

  1. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    Hi guys,

    The bike in question: a '91 zxr250c

    I'm hoping that some members may be able to shed some light on the strength of both the crank and the starter gears and ratchet(?) In terms of shearing torque? Or does anyone have some pointers on 'easy' non destructive tests?

    Cheers,

    Bryn
     
    Bryn duFresne-Mann, May 25, 2016
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  2. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    starter gears and "ratchet"

    IMG_20160524_192420.jpg IMG_20160524_192436.jpg
     
    Last edited by a moderator: May 25, 2016
    Bryn duFresne-Mann, May 25, 2016
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  3. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    because turbo? very odd question with very little info.
     
    Damus, May 25, 2016
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  4. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    Sorry, I have very little to give. I suppose I'm asking for a way to stress test the crank longetudinally, and the tooth shear of the mentioned gears. In hindsight, I doubt its been tested, unless someone has access to Kawasaki's design notes and specs xD
     
    Bryn duFresne-Mann, May 26, 2016
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  5. kiffsta

    kiffsta Senior Member

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    I daresay the engineers at Kawasaki would be the only ones who have that sort of data
     
    kiffsta, May 26, 2016
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  6. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    Anyone speak Japanese? ;D
     
    • Like Like x 2
    Bryn duFresne-Mann, May 26, 2016
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  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Draw it in Solidworks or similar, estimate material and do an FEA.
     
    maelstrom, May 26, 2016
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  8. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    That would be great: just takes a little more skill than I have, and Im wary of taking any direct relationship between a model and the real life metallurgy without very accurate dimensioning and measurement...
     
    Bryn duFresne-Mann, May 26, 2016
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sorry but that is as good as it is going to get.
     
    maelstrom, May 26, 2016
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  10. Bryn duFresne-Mann

    Bryn duFresne-Mann Active Member Premium Member

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    Fixing crank and applying torque to the starter gear with a torque wrench? I know a ballpark of my minimum..??
     
    Bryn duFresne-Mann, May 26, 2016
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  11. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    That would be a ball park of your maximum if you want to account for other potential factors.
     
    Damus, May 26, 2016
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