Kx 500 in 250sx chassis

NHtoWA421
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NHtoWA421
Just happened to be doing a random "250sx" search on cl and came across this a couple exits from me https://seattle.craigslist.org/tac/mcy/5731283593.html

Is this anyone's on here? Looks like a pretty clean conversion from what I can tell. It even has the clutxh access mod. Wonder if they had to cut the frame?
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NHtoWA421
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NHtoWA421 9/10/2016 7:58pm
9/10/2016 7:58pm
Title Edit. Sxf chassis. Sorry getting used to 1 armed phoning.
scooter5002
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scooter5002 9/10/2016 9:59pm
9/10/2016 9:59pm
I'm sure that might be a guy who posts on a FB page, CR500 conversions. He's done a few, mostly Honda, his name is Fred (don't recall the last name) and he is from Gig Harbour. The real giveaway is the Adam Millar parts, the CR500 God.

I don't think Fred is a member here, and I haven't seen him post on that page in a while. Used to be a regular, with his builds, then just disappeared. Did a 450SXF CR500 conversion, with the newly released Panthera Motorsports billet cases. Google that. $2500 USD just for a pair of them.
Sidecar
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Sidecar 9/10/2016 11:41pm
9/10/2016 11:41pm
Nice build, no corners cut by the look of things, the moving of the water pipe into the back of the cylinder to allow a lowboy pipe, the hydraulic clutch conversion and the 2 piece clutch cover etc...
a22
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a22 9/11/2016 3:56am
9/11/2016 3:56am Edited Date/Time 9/11/2016 3:56am
That is one pretty looking bike and looks really well done. Surprised you don't see a few more of the KTM/500 2T conversions opposed to the AF Japanese framed ones.
I would pick a steely framed conversion over an AF, if I was looking to buy. Sort of would be more comfortable thinking the steel framed may have been welded stronger than an alloy framed- what with the horror stories you sometimes hear about the AF's. Suppose though a steely could still have issues- guess it would have been cut or is it possible to slot a 5002T in with minimum cutting /welding?

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Kx125rider 9/11/2016 5:44am
9/11/2016 5:44am
eric513anderson wrote:
You guys not fans or hotrods cranks? Just curious...
IMO,oem is always much better and with a build of this caliber I would have expected an oem crank
NHtoWA421
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NHtoWA421 9/11/2016 7:03am
9/11/2016 7:03am
a22 wrote:
That is one pretty looking bike and looks really well done. Surprised you don't see a few more of the KTM/500 2T conversions opposed to the...
That is one pretty looking bike and looks really well done. Surprised you don't see a few more of the KTM/500 2T conversions opposed to the AF Japanese framed ones.
I would pick a steely framed conversion over an AF, if I was looking to buy. Sort of would be more comfortable thinking the steel framed may have been welded stronger than an alloy framed- what with the horror stories you sometimes hear about the AF's. Suppose though a steely could still have issues- guess it would have been cut or is it possible to slot a 5002T in with minimum cutting /welding?
Exactly! The need to properly post treat aluminum frames after welding really puts me off to the idea of hacking up an al. So much could go wrong if not done properly. Heck finding someone locally to post treat a bicycle frame was no small feat.
a22
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a22 9/11/2016 7:10am
9/11/2016 7:10am Edited Date/Time 9/11/2016 7:13am
Yes- Aren't the frames treated post welding by water treatment to cool the weld and in the cooling process the weld gains strength and integrety? I thought I read about this somewhere but do not know a great deal about alloy welding. Is it called Water Quencing or something?
eric513anderson 9/11/2016 8:03am
9/11/2016 8:03am
eric513anderson wrote:
You guys not fans or hotrods cranks? Just curious...
Kx125rider wrote:
IMO,oem is always much better and with a build of this caliber I would have expected an oem crank
Right on. From my expirince in the ATV world (no hate guys lol) everybody with a Banshee runs a hotrods crank. Stock stroke or stroker hotrods is better. Two totally different types of engines
nytsmaC
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nytsmaC 9/11/2016 10:35am
9/11/2016 10:35am
Price seems very reasonable for what you're getting there.. Shame though that the crank wasn't balanced by Crankworks or Falicon while doing the rebuild. There are a few things that I certainly would have done differently, just for personal preferences.
NHtoWA421
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NHtoWA421 9/11/2016 12:24pm
9/11/2016 12:24pm
a22 wrote:
Yes- Aren't the frames treated post welding by water treatment to cool the weld and in the cooling process the weld gains strength and integrety? I...
Yes- Aren't the frames treated post welding by water treatment to cool the weld and in the cooling process the weld gains strength and integrety? I thought I read about this somewhere but do not know a great deal about alloy welding. Is it called Water Quencing or something?
Yeah, with aluminum there is a heat affected zone around the weld. Some alloys weld better than others, but essentially welding can change the grain structure of the aluminum. After welding the aluminI'm is annealed to t0, manipulated (straightened) where needed due to warping caused by welding. Then dioped/treated to bring it back to the desired hardness. (I may be a bit off in the details)
a22
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a22 9/11/2016 12:40pm
9/11/2016 12:40pm Edited Date/Time 9/11/2016 12:53pm
NHtoWA421 wrote:
Yeah, with aluminum there is a heat affected zone around the weld. Some alloys weld better than others, but essentially welding can change the grain structure...
Yeah, with aluminum there is a heat affected zone around the weld. Some alloys weld better than others, but essentially welding can change the grain structure of the aluminum. After welding the aluminI'm is annealed to t0, manipulated (straightened) where needed due to warping caused by welding. Then dioped/treated to bring it back to the desired hardness. (I may be a bit off in the details)
Yes - very good information, I did read some stuff on it a while back and there was a real lot to it and was sort of really interesting to read.
I certainly for one, would not mess about cutting ally frames up and welding them with basic equipment in my home garage without proper training and some advice from a specialist or four.
This sort of looks abit like some of the stuff I read and what you are describing, maybe not totally ally related but is relevant and same sort of principles.
Treatment of welds

That Katoom does look the dogs though!

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