Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
kx500af frame lower bar cracked!
kyser777:
just before to take the bike for a ride, I discovered a crack near the engine mount connected to the the lower part of the frame :-o
it seems that the engine mount and the engine was not shimmed well and a tension occurred then the vibration of the 500 cracked the bar.
any ideas regarding the strategy to repair it
I want to fix it for good
kx500af (based on a kx250f 2009)
thanks
KXDINO:
lucky you saw that , hate riding when your frames breaks in half , had that happen to me on a yamaha. can get very hurt , if it was me i would find a kx250 04 roller ,slip that 500 in that then up date the forks ,but thats only me. redesign that area and extra gussets then reduce vibration.
umberto:
I agree with Dino. It sounds like you have fixed the problem that caused the crack, so I would strip the bike down to the frame and clean it up really, really well, have that area welded and then add some extra reinforcement plates over the area that cracked. I would add some extra material over the other adjacent area as well, just to make sure they flex the same.
I'm glad that you caught it before you rode it. Fixing a crack is just a matter of welding. Fixing you is a lot more involved. :-D
kxpegger:
Can you provide a picture of the head stay design? If this isn't done properly it puts tremendous strain on the engine cradle.
kyser777:
other picture to set your mind about the location
the rail coming to the Y piece is cracked
https://preview.ibb.co/gCFdep/20180905_114144_s.jpg
I really want to reinforce the rail zone
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