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Thread: Frame bracing, boxing vs tubing.

  1. #11
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    Quote Originally Posted by Buffalo Bill View Post
    Cool thread!
    Just like to know if any of these bikes were built for racing?
    Because reducing weight is important for race bikes.
    Thanks.
    A lot of these modifications were done by Yoshimura on the GS1000 racers of the time.
    They had powerful engines in a factory (touring) chassis that needed to be stiffened
    to handle that power.
    Reducing weight is important, but more of a thing that came later on when
    technology and knowledge combined to create stiffer and lighter frames.

    That is the reason manufacturers like Nico Bakker, Egli, Rickman etc were
    big - they were the pioneers that created lighter and stiffer frames for those
    engines.

    The factories picked up on that quickly, copying and improving on those designs.

  2. #12
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    Dec 2013
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    I'm hoping the removal of the stock seat and rear of the frame along with aluminium rear swing arm and a lifepo4 battery pluss removal of any unnecessary stuff is gonna negate whatever little weight is put on by this

  3. #13
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    Are you building a 750?
    Marc
    AIR COOLED MONSTERS NEVER DIE
    1978 GS1000C X2
    1978 GS1000E
    1979 GS1000S


  4. #14
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    Quote Originally Posted by kochic View Post
    Are you building a 750?
    Marc
    That's right!

  5. #15
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    This was exactly what I need. Homemade easy plate brake!

    https://mistrymaketool.com/Home/PostDetail/31

  6. #16
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    I made this with scrap metal for the boxing.
    Marc
    CIMG5560.jpg
    AIR COOLED MONSTERS NEVER DIE
    1978 GS1000C X2
    1978 GS1000E
    1979 GS1000S


  7. #17
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    from a flat plate to this.
    Marc
    CIMG5555.jpg
    AIR COOLED MONSTERS NEVER DIE
    1978 GS1000C X2
    1978 GS1000E
    1979 GS1000S


  8. #18
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    New Zealand
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    Quote Originally Posted by Buffalo Bill View Post
    Cool thread!
    Just like to know if any of these bikes were built for racing?
    Because reducing weight is important for race bikes.
    Thanks.
    If you're using a modified stock frame it's still a trade-off. Modern tyres have made frame stiffness even more important. From my experience and watching others, the period style bracing is nowhere near complete enough for modern slicks. The lower frame rails are not touched in the old model bracing. I've gussetted the area where the front crosstube joins the downtubes - and the area where the rear crosstube behind the motor joins the lower cradle tubes.
    Just folded 2mm sheet in an "L" section. This is enough to stop the front downtubes "scissoring" under lateral loads. The steering head area is better than Z1's - but that's not saying much.

    Talking to the guys involved with running the Team Classic Suzuki Katana in the IOM 2 years ago, the disadvantages of running what is actually a replica of a stock frame vs the purpose built XR69 replicas became apparent very early on. 119MPH laps represent shall we say, very large gonads.....Better suspension and geometry show up very quickly on the IOM.

  9. #19
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    [QUOTE=GregT;2582034] I've gussetted the area where the front crosstube joins the downtubes - and the area where the rear crosstube behind the motor joins the lower cradle tubes.
    Just folded 2mm sheet in an "L" section. This is enough to stop the front downtubes "scissoring" under lateral loads.

    Do you have a couples of pictures?
    Any help is welcome and thanks to the OP for the thread.
    I will relocate the headstock and brace the frame between the lower front crostube too.My first plan was to use 2 tubes in a V between the crosstube and the OEM bracing under the headstock.
    Marc
    AIR COOLED MONSTERS NEVER DIE
    1978 GS1000C X2
    1978 GS1000E
    1979 GS1000S


  10. #20
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    No, sorry lost the pics I had. Bike's at the owner's place now.
    The gussets were simple triangle folded sheet, about 50mm on a side.

    I wouldn't have thought there'd be room for an X brace under the steering head with the pipes there.

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