Maintenance & Technical > KX500 Steel Frame Conversion (SFC)

2003 KX 250 SF Conversion

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umberto:
I've been sitting on a 1989 K5 engine and goodies that I bought off of eBay for a while now. I'm about ready to start the conversion into a 2007 KX 250 that I have owned for several years.  I'm taking a welding class at the local technical school, and needed a project to practice on, so off we go.  The class starts in June, so I am beginning the process of getting everything swapped and the mounts and pipe ready for welding.  I have already procured the correct drill bit, and the used CR 500 pipe is on its way.





I will be selling the 07 250 motor if anyone is interested (I will list in the for sale section when I get it ready).  I am putting a fresh top end in the motor with a Wiseco forged piston, Wiseco rings, bearing, wrist pin, and clips.  I am also going to clean and inspect the power valve, and do a leak down test.  I will be selling the motor with the FMF Gnarly pipe, carb, and electronics.  It would be a perfect engine for an AF swap.  I'll even ship it for free.  I should have some pics and video of the rebuilt engine by next week.

kawboy:
What brand side stand is that on the 250 ? I really like the way it mounts. That 500 engine looks like an '88 , but I could be mistaken.

umberto:
It is an 88.  I've had it so long, I forgot the year.   :-D. The side stand is made by Trail Tech. It says it only fits up to a 2005, but it has been on both my 07 and 04. They run about $120, and I got mine from Rocky Mountain. If you buy one, got to Trail Tech's website and buy a replacement foot for $5. I took about a half to 3/4 of an inch off mine and it works much better.  To cut it, you will have to cut the foot off with the aluminum tube.  The feet are impossible to remove. Or you can stack the spacers, but that makes the mount stick out a bit more at the bottom.

kawboy:
Thanks. My '05 needs one of those.

umberto:
I got the top end rebuilt on the 250 today with a Wiesco forged piston, bearings, and cometic gaskets. I've rebuilt tons of two strokes in my day, but I still get such a rush from taking one apart, putting it back together, and hearing it fire right up. This thing sounds stout, I can't wait to ride it tomorrow. I'll break it in, and probably get it on eBay next week. If someone on here would like it, I will make you a deal for less than I'm selling it on eBay. The package will include the engine, carb, electronics, and FMF Gnarly pipe.  This was my personal bike, and was never raced or abused. I put about 40 hours on a rebuild I did when I got it.  When I put the new piston in today the bottom bearings felt excellent, and the seals were in great shape.

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