Honda 2005 CRF250X - Valve Seat Refacing

CYLINDER HEADIV ALVES
Remove the valve and inspect the valve seat face.
Tha valve seat contact should be within the speci-
fied
width and even all around the circumference.
STANDARD:
IN / EX : 0.90 - 1.10 mm (0.035 - 0.043 in)
SERVICE LIMIT:
IN / EX: 1.7 mm (0.07 in)
NOTE :
• When the service limits are exceeded, replace
the intake valve and recheck the valve seat width.
If the seat width is not within specification, refaee
the valve seat (page 8-20).
Inspect the valve seat face for:
• Uneven seat width :
- Replace
the valve and refaee the valve seat.
• Damaged face:
- Replace the valve and refaee the valve seat.
The valves cannOI • Contact area (too high or 100 low l
be ground. If a - Refaea the valve seal.
valve face is burned
or badly worn or If it
comacts the seat
unevenly, rep/ace
the
valve
VALVE SEAT REFACING
t
.,.
SEAT WIDTH
DAMAGED FACE
UNEVEN SEAT WIDTH
TOO
lOW TOO HIGH
Follow the refacing
manufacwrer's
operatmg
mstructions.
Valve seat cutters/grinders or equivalent valve seat ,---------------------,
refacing equipments are recommended to correct
worn valve seats.
8-20
•