Valve Seat Refasing - Honda CRF450X 2005 Service Manual

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Inspect the valve seat face for:
• Uneven seat width:
- Replace the valve and retace the valve seat .
• Damaged face:
- Replace the valve and reface the valve seat.
The valves cannot • Contact area (too high or too low)
be ground. If B -
Refaee the valve seat.
valve fsce is burned
01 badly
worn or if it
contacts the sear
unevenly, rep/ace
the valve.
VALVE SEAT REFACING
FOllow the reracing
Valve seat cutters/grinders or equivalent valve seat
manufaCT urer's
refacing equipment are recommended to correct
operating
worn valve seals.
mstruCf!OfIS.
If the contact area is too high on the valve, the seat
must be lowered using a 32" flat cutter.
If the contact area is too Iowan the valve, the seat
must be raised using a 60° interior cutter.
CYLINDER HEADIVALVES
.0.
DAMAGED FACE
UNEVEN SEAT WIDTH
TOO lOW
TOO HIGH
9
\45
0
Q
V
"\ Soo
\ 32°
\
'"."~. ~:;~'
CONTACT TOO LOW OLD SEAT
~
. .
~WIDTH
L
60°
9-31