Cylinder Head Assembly - Honda 2010 CRF250R Service Manual

CYLINDER HEADNALVES
INTAKE SIDE :
After retacing, wash the cylinder head and valves
I
NOTICE
I
Do not lap the intake valves. They
are
titanium and
have
a
thin oxide coating. Lapping will damage this
coating.
Replace the intake valve with
a
new one.
EXHAUST SIDE :
After cuttmg the exhaust seats, apply tapping
compound to the exhaust valve face, and tap the
exhaust valve using light pressure.
After lapping, wash any residual compound off the
cylinder head and valves.
I
NOTICE
I
Excessive lapping pressure may defonn or damage
the
seat.
Change the angle of the lapping tool frequently to
prevent uneven
seal
wear.
Do nol allow any lapping compound to enter the
guides.
CYLINDER HEAD ASSEMBLY
" 0 . ' 11 '
VALVE conERS
\
"h""
sidec
0",
"eeo
~
$"
STEM SEAL
VALVE GUIDE
a~
O-RING
WATER HOSE JOINT
~-
BOLT
SPRING RETAINER
INSULATOR
After '11 :
~
INTAKE VALVE
EXHAUST
VALV~
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