Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

JFab frame rails breaking

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jholt:
Any one having any issues with lower frame rails breaking on their 500af. Mine broke this weekend while racing motocross, they broke about two inches down from the "Y" section.

KevinTwoStk:
Do you A/F guys heat treat your frames after welding?

Did the frame rails break at a weld, or close to a bend?

Do you have photos?

I don't have an A/F bike, but I'm curious anyway.

Thanks!

kxpegger:
Mine was built by Service Honda. Don't know what their process is but I've beat the snot out of mine in the Nevada desert and no issues yet (4 years). I know welding aluminum is a tricky business. The metal has to be cleaned spotless and from what I have read it needs to be pre-heated to avoid bittleness and hardness while welding. There's also the type of aluminum, rod filler and amperage while welding to consider. A lot of welders can make it look pretty without really knowing what they are doing.

stevea100m:
I bent my own rails out of 6061 if i remember right and had them welded about 6 months ago now. Now Im no A motocrosser but I did have my cousin who is race it a couple of weekends ago at one of the roughest track here in michigan and no problems and Ive rode a few enduros and harescrambles with the same results and I did not heat treat the frame

jholt:




Did not heat treat they broke right above front motor mount and right below the upper bend I have motocrossed this bike for about 3-4 months

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