Honda CRF450R 2009 Service Manual page 270

CYLINDER HEADNALVES
Blow oul all oil passages in the cylinder head with
compressed air.
Install Ihe spring seal and new stem seal.
l ubricate the
valve
stem and stem end sliding surface
with molybdenum oil solution.
Insert the valves into the guide while turning
it
slowly to
avoid damage to the stem seal.
Note Ihe valve spring identification marks.
- Intake valve spring: Orange paint
- Exhaust valve spring: Gray paint
InstaH the valve springs with the lightly wound coils
facing the combustion chamber.
Install the spring re tainer.
Install the tappet hole protector into the valve lifter bore.
TOOL:
Tappet hole protector
TOOL, U.S.A. only:
See Instructions on page 9·20
07HMG·MR70002
not available i n
U.S.A .
SPRING SEAT
VALVE
~~.~~~
INTAKE VALVE
I
J
TAPPET
EXHAUST
J
PROTECTOR
To preVfJnt
loss
of
Install the valve cotters using the special tools as
~~~~~;;~~~~~~~~"""=~=l
tension, do not
shown.
I
compress the valva
springs more than
necessary.
9-28
• Grease the colters 10 ease installation.
TOOLS:
Valve spring compressor
Valve spring compressor
attachment
07757..0010000
07959·KM30101
,
,
,
,
COTTERS