Maintenance & Technical > KX500 Steel Frame Conversion (SFC)
KX250 Chassis With 500 Motor
BigGreenMachine:
More please! What did you use to cut them down with?
don46:
The aluminum part of the swingarm isn't to critical, it can be off a little and not hurt anything. The spacer has to be square, I cut the swingarm on a mill and the spacers on a lathe. Like I say the swingarm isn't that critical, it could be cut with a hacksaw.
The attached pictures are for the head stay, the stock stay must be cut off and either a bracket such as I have or none at all. The bottom motor mount on the 250 chassis will fit, the front needs to be cut off and repositioned, and lastly the motor mount at the rear of the motor needs to be bored to 17mm
BigGreenMachine:
Cool!
Step one - split cases and drill rear motor mount on drill press
Step two - after installing the motor install the bottom motor mount bolt
Step three - cut front mounts off, bolt them to motor and line up in new position, tack then weld
Step four - fab top mount for new head stay
Very straightforward IMO.
Thanks for the pics, appreciate them.
gwcrim:
Man this is killing me. I have an '02 250 as well as a 500. Good thing I don't have a machine shop! Or maybe it's a BAD thing. :?
gowen:
--- Quote from: gwcrim on March 30, 2007, 01:46:25 AM ---Man this is killing me. I have an '02 250 as well as a 500. Good thing I don't have a machine shop! Or maybe it's a BAD thing. :?
--- End quote ---
Crim, that is what killed me too.. But decided I wanted to keep my KX250 for track racing.. Now, I just use my YZ for the track only. I wouldn't dream on dropping a 500 into a track machine. I am much faster on a 250 on the track than a 500.. Just the power is easier to corner and jump with. But, trail riding? a 250 feels like walking.. ;-) Cool project though! I can't wait till work slows down and I can get out and just ride.. Can't even get that in these days.
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