Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Broken AF frame - Do you know of any?

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nikabele:
I've heard about people heat treating or stress relieving, but my question is, what every bodies opinion on doing the frame rail mounts along the bottom with the two top mount front and back. I am done with my frame I have both front and back top mounts and am deciding if I need to heat treat it. With the front top Mount you are basically making the motor part of the frame, not allowing the weight and pivot of the motor itself directed towards the fabricated y yoke. Hope I am not asking a repetitive question. What does everybody think?

jBernard:
i'll say this....
service honda doesnt heat treat
and i just found out lately that their whole rail design is 2pc SOLID machined pieces. not bent tubing.

the VAST majority of the distributed weight is on the swingarm pivot and the top engine mount on the frame rails (below yoke).

Starky307:
Has anyone considered that by moving the "y" section up we have actually exposed the frame rails to a high stress point?
The point most of these breakages is occurring is in an area that the standard 250f or 450f would have the main large spar still in place.

With my build I put a lot of effort into the rear head stay to ensure it was positioned to provide the best load sharing opportunity possible.
I am a firm believer that those that use a 09 or later frame need to mount the rear head stay from the spar not from the side.
Don't forget that the 09 onwards 4 strokes share the load of the top of the motor across the rear and front of the head so the strength isn't required in the rear so much.

That's my $0.02

I hope my theory is right as I'm about to start riding my build in the coming weeks, I will be monitoring the frame each ride.

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