Honda CRF50F 2004-2015 Service Manual page 90

CYLINDER HEADIV ALVES
If the contact area is too high on the valve, the seat
must be lowered using a 32°or 30° flat cuner.
If the contact area is too low on the valve, the seat
must be raised using a 60° interior cutter.
CONTACTTOO HIGH
~LD
SEAT
~ -:3W~' 1 32'
CONTACT TOO LOW
After cuning the seat, apply lapping compound and
engine oil to the valve face, and lap the valve using
light pressure.
Excessive lapping
pressure may
deform or damage
the sea/.
Do
not
Change the angle of lappi ng tool frequently to pre-
al/ow/appmg conr-
vent uneven seat wear.
pound
to
emer the
gUides.
After lapping, wash all residual compound off the
cylinder head and valve.
ASSEMBLY
CYLINDER HEAD
RIGHT SIDE COI'ER
9.8 N-m (1.0 7 Ibf.ft)
GASKET
~
....
ROCKER ARM SHAFT
ROCKER ARM
~
I
111
~
VALVE GUIDE
~~SPRINGSEAT
~
STEM SEAL
~
W
~
VALVE SPRING
IIIiiiII
V
SPRING RETAINER
VALVE COTTERS
7-14
~
. .
~~~gi'~AT
~~L 60'
INTAKE VALVE
CAMSHAFT