Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Not a GOOD Day on the 500 AF

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jholt:
Well as some that watched my build just a month ago and I appreciate everyones kind words, this sunday was not a good Day. Landed of a 70' Foot triple and the motor gernaded. Rod broke have many of you KX 500 guys seen this happen before, is the rod a problem in the 500 motor. I am just really disappointed right now and very frustrated... It took a month to build and 4 rides to destroy...

This is what she looked like



and Now this is her I have to start all over again...

Spizz:
Ouch. So sorry for your loss, did you freshen the motor during your initial build?

The Flyin Hawaiian:
WOW! :-o

kxpegger:
Can't tell from the picture for sure but the piston edges look like the motor was running super lean. There must have been some serious detonation going on! That's probably the worst blown engine I've seen.

The only other thing I can think of is that a weld on the frame rail or the frame rail gave out pulling her apart but this seems unlikely.

Was the engine all OEM parts?

jholt:
Kx pegger I think the camera flash makes the piston look worse, Everything was stock, bore, crank, with Pro X piston, plug has a nice brown color and everyone that has come through the shop and looked at it has come to the conclusion that the rod must of already had a stress fracture in it due to the inconsistent metal coloring at the break point. I replaced everything in this engine but the rod or crank and I had no history on it, But it all was in spec and no indication that it had any issues.

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