Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

KXF 250 2007 for KX500AF

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Dutch-K5 Fan:
Is a Kxf250 from 2007 a good frame to start with for building a KX500AF :? :?
I can get a kxf without engine for ?1450,- and a 88 engine witch is in parts for ?150,-
Sould I take the change??? Or is this a difficult frame/engine combo to go with???



Dutchie

jfabmotorsports.com:
Dutch...Are you going to be doing this yourself? '89-04 engines are all the same. If you ever need parts its something to think about. e-mail me if you would like to see my build pics.

AJ:

The 250F chassis is more difficult that the 450F..
quite a few more hurdles to overcome as the frame is just smaller than the engine you're trying to put into it.. 
but yes, it is possible.
 
 to make thinks considerbaly easier,, I'd look for a 450F as a start to the project...

Dutch-K5 Fan:
I'm gona build it my self, only haven't welded aluminum before. That I
led some one else do. I'm a Agriculture mechenic/ maschine builder.
What about the 250f airboot? Does it fit a K5 (pwk39 if i'm correct) carb???
Or should I use a 250 2stroke piece?

I hope to take a looke at the frame thursday, and donor bike on saterday
if the frame is in good shape. It should have everything exept the engine, ignition and card.


Dutchie

don46:
As for the frame I would take AJ's advice and use the 450 frame, there is a bit more clearance front to back than the 250f chassis.  As for the motor, the 88 motor is a real powerhouse, but, it uses the old style KIPS system and the drums  and shaft are obsolete. I have an 88 cylinder and head that the valves were stripped when trying to buy new from Kawi I was told un available. with some effort you could modify the cases to accept the newer 89-04 cylinder, not sure it would be worth it, or get a set of 89-04 cases and transplant the 88 parts into them. I think AJ is using a honda 250 2t air boot, I used a 99-02 kawi airboot, it had the best angle. The stock 250f/450f airboot will not work it is way to small.

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