Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Dutch 500AF Conversion 250KXF 2009

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Jos197AF:

--- Quote from: hulkteam476 on March 26, 2014, 10:46:22 PM ---You know I told you this but you do whatever you want my friend.
Just, as you passed spectrometer, your original frame?
I say "simply" not to go into details.
In addition be warned that you have the machined part (7075) in full.
The 7075 does not manage at all the same constraints: bending, vibration ... compared to the 6061 or 6063... for this application. You also have to know that the 6061 is much better for welding performance and is also used in aeronautics.
This said, you were right to try. After testing you can give me your feedback.
Thx

--- End quote ---

Don't get me wrong. All information is welcome. My English isn't that good, I don't understand everything what is written about this.
I know its risky, and maybe I replace the Y part before I'm going to ride the bike. One evening work and the job is done. But I am also curious about how it will stand. Before I've ordered the 7075 I've got some wrong information about 7075. We have got years of experience with welding aluminium, but usualy 6082 or just cast engine cases for reparation for example. Not special alu alloys.
Whats the best option to use for the chassis? 6061, 6063, 6082, 7005?  Or which one else? Which heat treatment? T6, T651,...?

hulkteam476:
for me the best: 6061 with T6.
Read This (sorry in french)

http://www.aubertduval.fr/uploads/tx_obladygestionproduit/6061_FR.pdf
Thx

jBernard:
JFabs rails are 6063 and i talked to him about them. 6061 is T6 full strength heat treated, 6063 i think is not fully treated or not at all. so his idea is that to bend a rail thats more malleable, will induce less stress to the metal than one that is hardened and more brittle. He said he never had a rail breakage on his 6063 ones and he doesnt HT. pretty surprising.

mxaniac:
6063 has a much lower yield strength in comparable tempers than 6061.  If you're going to heat treat afterwards 6061-O would have the benefits of being softer for forming, then when you precipitation harden it you'll get your desireable strength back.

I still think 7005 is a great choice because it is so easy to heat treat which is why it is so widely used on frames.  It's probably what Kawasaki used in the first place.

jBernard:
who did your HT and how much was it?

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