Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

JFab frame rails breaking

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trim:
On my bike I used the same style headstay mount as yours accept added a extra tab linking the round cross shaft to the lower engine mount bolt holes.The reason for this was looking at it made me think the motor would pull down in the frame with nothing stopping it from rolling forward. Just my .02
If you look on the last page of my build it shows a pic

kxpegger:
After looking at your pictures I'm convinced that it is your headstay design that put to much stress on the frame rails. It is not a straight tight pull. It is a scissor that will allow forward and down movement of the engine. I would post a pic of how they did my SH but to get a good view I would have to pull the tank. Anyway they welded a very beefy mount to the cross spar of the frame not the perimeter frame tabs that the 450 engine used. The way SH did it there is absolutely no way the engine can rock forward and down unless the head stay of the cylinder head breaks or the frame cross spar or weld breaks. This area was very well over engineered by SH. I'll try to get you a pic tomorrow as it is about 120F degrees in the garage right now and I'm not in the mood to set up the portable swamp cooler. I live in Vegas!

suicyde:
My brother in law broke his service honda frame as well, he is a pro class mx'er. that af got manhandled, and it didn't hold up. It got patched up, and sold off.

jBernard:
^ do you know exactly where it broke?
i cant say ive seen a stock frame rail ever brake. obviously they are forming them in a less stressful way and probably heat treating after welding. something to consider since i'm surprised no one has gotten injured yet. pretty scary.

KXDINO:
The tubing looks kind of thin does it not? I like what ktm does,4130 and lighter  than any aluminum jap frame out there;plus there more room to work on where carby goes etc.

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