Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

1992 KX 500 to KX 250 F 2011 Conversion

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81cr450:

--- Quote ---then bracing them all together with some .250" steel bar.
--- End quote ---

That actually builds in stress points as AL & steel flex at different rates. I like the no weld mount/ frame mod idea. Im working it on a honda using thin .061 4130 plate & using the skid plate as carrier , hoping that I havent built in to much of a stress point. The process of anealing when AL is heated is some scary crap to bet your life on

jBernard:

--- Quote from: 81cr450 on November 09, 2013, 01:04:13 PM ---
--- Quote ---then bracing them all together with some .250" steel bar.
--- End quote ---

That actually builds in stress points as AL & steel flex at different rates. I like the no weld mount/ frame mod idea. Im working it on a honda using thin .061 4130 plate & using the skid plate as carrier , hoping that I havent built in to much of a stress point. The process of anealing when AL is heated is some scary crap to bet your life on

--- End quote ---

i kind of see what you mean about the different rates of expansion. but shouldnt the steel move less than aluminum due to the way higher melting point. i was thinking that brace would just hold the cradle in its original positioning during HT and not let it warp or anything.

Christini (the guys that do the AWD) bikes, i found who they use for their heat treating. and i was asking how under annealing they dont warp and distort. he said that a lot of it is how its mounted during the treatment process to minimize any distortion. he's the one that recommended bracing it with a removable brace before treating. he also said you could tack weld some alum braces (just a few rods at random spots) and then just grind off after treating.

ive never heard a clear answer as well on what the factory does. I would be surprised if they didn't HT. it seems like the frames are engineered for aluminum to be certain thickness at certain points for flex and rigidity. well, take off 30% of the strength at those areas now due to being heated when welded. seems like they are more likely speced using 100% strength material throughout. and all annealing does is get it back to that point after its been altered.

81cr450:
Sorry I'm an idiot & read it wrong. I understood bolt in cradle / steel plate reinforcement . Dur

German-need-help:

--- Quote from: ylwgtr on November 09, 2013, 05:43:28 AM ---That's because it's simply not necessary ....I know for a fact that the factory do not do this.I have done about 20 Hondas and haven't had a failure as yet


--- End quote ---

Bike is finished! without heat treating!!!
In Germany all tracks are closed yet, because the winters are cold and full of snow.
There will be enough time for the aluminum to stress out alone, without a heat treating furnace.
In 3 month (february/march) we will check up the strongness of the frame of jumping some big jumps.  :roll:

The 2 honda CR 500 AF builds my kollege has done before, also never had seen a heat treat furnace and were finished also before the winter :-)






German-need-help:








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