Valve Seat Inspection/Refacing - Honda CRF110F Service Manual

The
valves cannot
be
ground. If the
valve face is
burned, badly
worn
or
If It
contects the
seat unevenly,
replace the 118/ve.
VALVE SEAT INSPECTION/REFACING
Disassemble the cylinder head (page 8-12).
Clean the intake and exhaust valves thoroughly to
remove carbon deposits.
Apply a light coal of Prussian Blue to the valve seats.
Tap the valve against the valve seat several times using
a hand-lapping 1001, without rotating the valve to make a
clear pattern.
Remove the valve and inspect the valve seal face.
The valve seat contact should be within the specified
width and even all around the circumference.
STANDARD: 0.9 - 1.1 mm (0.035- 0.043 In)
SERVICE LIMIT:
1.6 mm (0.06 in)
If the valve seal width is not within specification, raface
the valve seal (page 8-21).
CYLINDER HEADNALVES
SEAT WIDTH
8-21