Food?
Unfortunately I have never tried it.
According to Kawasaki
CYL ID 0027 - FITS 05 KX250 11005-0027 BORE 66.40 STROKE 72MM
CYL ID 0054 - FITS 06-07 KX250 11005-0054 BORE 66.40 STROKE 72MM
The exhaust valves are the same.
Side exhaust valves: FITS 05-07 KX250 - 12005-0019
Center exhaust valve: FITS 05-07 KX250 - 49116-0007
HEAD: 0034 FITS 05-06 KX250 - 11001-0034
Gaskets: FITS 05-08 KX250
FRONT EXHAUST VALVE COVER: FITS 05-07 KX250 - 14091-0217
EXHAUST VALVE COVER RIGHT: FITS 05-07 KX250 - 14091-0215
I see no reason why it should bolt right on but then again I have never tried it
I know that there are people on this site that know for sure..