Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Quick question on frame breakage

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SS109:

--- Quote from: cmotodad on June 23, 2015, 04:57:12 PM ---I really think it has more to do with the vibration when mains are worn and crank not tight. JMO. The ones we broke had the same engine and it vibrated more than the one I have now.

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Interesting. So, I guess that begs another question. Were all the failures KX500 conversions and NOT with a KX250?

brooksie:
I seem to remember a 250 conversion where the frame snapped in a big way! The rider was knocked out cold and was very lucky to come away with just bruises. I also seem to recall he had been riding the bike very hard and completing some big jumps. I think riding ability, style, aggression are factors which play a part in the longevity of a "home grown" conversion.

kxpegger:

--- Quote from: sandblaster on June 22, 2015, 04:33:05 PM ---Motocross



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That failure in my opinion is most likely caused by an improperly designed head stay mount. All of the force is being absorbed by the frame rails instead of the frame.

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