2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 136Get this manual
CYLINDER HEADIVALVECAMSHAFT Inspect the valve seal face for: Damaged face:Replace the valve and retaee the valve seat Uneven seat width:Replace the valve and refa ee the valve seat
DAMAGED FACE
Contact area (too high or too low)Refaee the valve seat
UNEVEN SEAT WIDTH
TOO HIG H
REFACING
Follow he refacing manufacturer's
Valve seat cunersgrinders or equivalent valve seat refacing equipment are recommended to correct