2004-2005 Honda TRX450R Factory Sevice Manual, Page 151Get this manual
CYLINDER HEADIVALVE Inspect he valve seat face for:
Da maged face:Replace the valve and retace the valve seat Uneven seat idth:Replace he valv and retece the val ve seat
DAMAGED FACE
Contact area (too hi gh oo low)
U NEVEN SEATWlDTH
- Retace the valve sea t
TOO HIGH