Maintenance & Technical > KX500 Steel Frame Conversion (SFC)
2003 KX 250 SF Conversion
dave916:
Both being sleeved is a pain,
The ebay88 sleeve is going to a bit restricted on the inlet side{ inlet ribs on sleeve}
Not sure how your orginal cylinder will work out
issues will be higher exhaust centre port {and no centre flapper valve} will loose bottom end
Sub port not matching outlet
matching sleeve on inlet side miight have issues
Are the kipps chambers stiil opened on orginal cylinder? {since no valves were fitted]
I i would run the ebay cylinder {if no wear} or try and find a cheap 88 plated cylinder
A stock 88 for example {88 is one of the best early cylinders}
inlet side
umberto:
The 88 cylinder does have the KIPS valves, they are just out right now. I have a buddy trying to make me a copy out of steel. I think I will take a closer look at that cylinder and see if it will work with this engine. Thank you for the advice everyone. If I get adventurous, I will get out the air grinder, harken back to my hot rod days, and give Sandblaster's port mod a try. :-D
alexander-vmann:
after reading this i kinda wanna put my 87 k5 in a 2006 kx 250, thats for sale near here :-D
umberto:
It's really not that tough to do. The 06 should be even easier than this 03 has been, because it's a little bit bigger bike.
zz3gmc:
Actually, the 05-07 KX250s have a narrower frame. My 07 feels like a 125 compared to the 03/04 KXs. I prefer the 03/04 over the newer gen frames. 05 up have a quirky handling trait that would just be accentuated with a 500cc mill bolted in place.
I believe it would be pretty much the same amount of work to do though.
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