Yamaha WR250R Threadfest

Discussion in 'Thumpers' started by gjcarving, Nov 23, 2013.

  1. Bultaco206

    Bultaco206 Back-to-back motos suck

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    Have you calculated the additional stresses that the more rigid aluminum subframe will place on the mounting points on the frame? And calculated the shear strength of the new bolts that it will need?
  2. CDN Rick

    CDN Rick Canoodia Eh?

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    I see you bought a second chevy. But I guess at least yer willing to admit it.

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  3. Kerz13

    Kerz13 Adventurer

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    figured 8.8 stainless bolts made sense.
  4. Bultaco206

    Bultaco206 Back-to-back motos suck

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    Ok, and what's the calculated shear strength of an 8.8 based on the amount of torque that you've chosen for that high-stress joint?

    If you haven't done the math on all that you're a seat bounce away from having a trials bike with a shock mount impaled up your pooper.
  5. CDN Rick

    CDN Rick Canoodia Eh?

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    :lol3:lol3:lol3:lol3
  6. Kerz13

    Kerz13 Adventurer

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    Don't give me any idea's or i might make a trials bike out of it next :photog
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  7. Bultaco206

    Bultaco206 Back-to-back motos suck

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    I'm not trying to be a dick. :lol3

    I'm trying to make you understand that the frame and subframe on that bike were designed they way they were for a reason. You're not only using the bike for something it wasn't designed for - but now you're altering the rigidity and tension of something designed to support weight, absorb energy, and diffuse it. Personally, I think you're asking for trouble long-term unless you've accounted for all of it.
  8. Kerz13

    Kerz13 Adventurer

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    With the WR having a weight carrying capacity of 400lbs and me being 1/2 that we figured grade 8.8 stainless bolts on the 4 points was a safe bet with a square tube aluminum subframe. Much stronger hardware than Yamaha used on the YZ and WR. Not really overthinking it past that.
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  9. Bultaco206

    Bultaco206 Back-to-back motos suck

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    Ok. And are you aware of any differences in the grade/strength/thickness/dimensions of the frames between the YZ/WR bikes and your dualsport?
  10. Kerz13

    Kerz13 Adventurer

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    Not aware personally. Fabricator is building it. He said he'd go with a bar stock that exceeded the rating of the steel on the stock subframe. Building only to the rear of the seat with a bracket for the tail light. No support for a cargo rack. Also building a new engine cradle. When i get it back swapping the aluminum skidplate for a composite one.
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  11. Bultaco206

    Bultaco206 Back-to-back motos suck

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    Ok, man. Good luck! :beer
  12. andrewgore

    andrewgore Gôremā

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    Could you post the FEA to validate the strength of everything. @Bultaco206 is concerned for your safetys.....and or running over your bike parts as they fall off on the trial. :dunno
  13. Dirtleg

    Dirtleg Adventurer

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    That's exactly why I ride the WRR. I have been bad and don't deserve to ride anything better. :hung
    Think of it like penance of a sort.
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  14. GR0NK

    GR0NK Got some screws loose!

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    I bet he doesn't even know Kynsian math. :fpalm



    Sean :brow
  15. Bultaco206

    Bultaco206 Back-to-back motos suck

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    You mean like a 120 percents of a tapped-out sardinezzzz can?

    The dude would be better spent addressing footpeg mounts than "trick" aluminum subframezzz.
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  16. Navin

    Navin Long timer

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    Duder just neadzzz a Pitster! Even kyns must admit its statistically superior!
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  17. Bultaco206

    Bultaco206 Back-to-back motos suck

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    He could plate it AND have a better dirtbike...one that's made to have its wheels off the ground.
  18. Navin

    Navin Long timer

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    Butt, just think of the cool story he can tell in physical therapy....

    I thought you could just click the clickerzzzz of those Whirrrrrzzzz?
  19. Bultaco206

    Bultaco206 Back-to-back motos suck

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  20. Night Falcon

    Night Falcon Spilt milk makes me cry like a girlie girl :-(::

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    Ladyb......?
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