Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Broken AF frame - Do you know of any?

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mxaniac:
Based on the "my poor bike" thread it sounds like some broken frames have been experienced.  Given the variation in weld material, motor mounts, head stays etc. all we can really do is look for any trends that exist.  I thought it might make sense to start a "registry" if you will of any known breaks.

My 2006 450F based frame has broken.
DSPMOTO has had a 2006 based frame break.

Anyone else?

mxaniac:
Here was another one, looks like it was a 2008.

http://www.kxriders.com/forums/index.php/topic,10642.0.html

motopunk:

--- Quote from: mxaniac on March 24, 2014, 07:02:20 AM ---Here was another one, looks like it was a 2008.

http://www.kxriders.com/forums/index.php/topic,10642.0.html

--- End quote ---

in the most cases they broke, because of wrong heat treating by the aluminium-welding ..thats a very important fact.. aluminium-frames are much more stiffer than steel-frames, that makes the modifying and welding a bit more tricky as the same work on steel-frames...
there were also some years of no modified honda oem-4stroke-al-frames that broke like glass...

jBernard:
forgot about JHolt's breakage.
looks like in same place as yours. his headstay looks a bit weird. almost like the engine could rotate in the cradle, looks like a 2pt mount system rather than a 3pt that cant rotate.
can you shoot us a picture of your headstay?

mxaniac:
I still haven't had a chance, bit it is a cross tube between the original mount points with tabs to the head.  Not as rigid perhaps as some have suggested it ought to be.  I'm getting concerned about how much load might actually be on these engines, I doubt they were designed to be that much of a stressed member.

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