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  • aluminum swing arm

    Has anyone ever extended an aluminum swingarm for a motorcycle?

  • #2
    I have done five or six of them.

    One was an 8" add-on for a GSXR-1000. Scary! It's what he wanted, though. I told him i was not comfortable with it even though I applied reinforcement plates and a stiffener rib because he wanted me to blend the extension by grinding/snading the welds flush on any appearance surface so that it could be polished. I ran into the guy about three or four years later and he said it was still hanging on!

    The GSXR was fairly simple using 3X2 tubing, if I recall. The Kawasakis tubes have a bevel on the top and bottom, outside edges, so the tubing for the extensions has to come from another Kawi swingarm. The basic sizes of the tubing are right at 2"X3" and are only 1/8" thick.

    I have a pic of one of them somewhere....I will post it later tonight when I get home.

    Scott
    Last edited by MXtras; 10-23-2007, 03:31 PM. Reason: added detail
    American Made

    Haul your MX or offroad bike without straps -> www.mxtras.com

    MXtras' Storage Cabinet thread - http://www.hobartwelders.com/weldtal...ad.php?t=15905

    MXtras' Storage Cabinet Plans - http://reference.toolandfab.com/writ...nets/index.htm

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    • #3
      yeah , a guy wants me to extend his by 10 in.
      I'm going to slip in a plug between the extension and the swing arm and drill and plug weld it first. then weld the joint, then add extra plates along the length.
      Plus it has a ladder type stiffener which will go back.

      But the 6063 Aluminum is heat treated and will need to be treated again after welded to get the strength back

      Did you heat treat yours after you welded it?

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      • #4
        Originally posted by mopakel View Post
        But the 6063 Aluminum is heat treated and will need to be treated again after welded to get the strength back

        Did you heat treat yours after you welded it?
        I did not. I am still unable to find a local source.

        For the 8" GSXR extension - I plugged the ID and welded the tubes to the plug with a total of three passes. The plug had a V milled into it at the point of intersection for additional mechanical joining. The joints were built stronger than the factory seams from what I observed - most of them were butt joints. And again, after 3-4 years it remains intact even with the exterior weld ground flush.

        Here's a shot of a 4" extension for a Kawi. It was simple enough. This guy runs drags here in Virginia and in NC and is the source of all of my swingarm extension work. This was actually the very first one I had done.

        As you might be able to see - I was still moving into my shop.



        Scott
        Last edited by MXtras; 10-24-2007, 01:10 AM. Reason: photo
        American Made

        Haul your MX or offroad bike without straps -> www.mxtras.com

        MXtras' Storage Cabinet thread - http://www.hobartwelders.com/weldtal...ad.php?t=15905

        MXtras' Storage Cabinet Plans - http://reference.toolandfab.com/writ...nets/index.htm

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        • #5
          well since it's still together after 4 years thats makes me feel a lot better about doing it

          thanks
          steve

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