Honda CRF450R 2009 Service Manual page 263

U.S.A. only.
An equivalent tool can easily be made from a plastic
35 mm film container or plastic water bottle as shown.
CYLINDER HEADNALVES
5mm ....... r""5mm
TOP VIEW
•
31 mm
15mm
To
prevent loss of
tensIOn,
do
not
compress the valve
springs
more
than
necessary
to
remove the
cotters.
25 mm I.D. when compressed
Remove the valve spring cotters using the special tools.
G~~~g~~~~~~;;======l
Merk all parfs
during disassembly
so they can be
installed
In
thelf
origma/Iocations.
TOOLS :
Valve spri ng compressor
Valve spring compressor
aUachment
Remove the followi ng:
- Spring retainer
- Valve spring
- Valve
- Stem seal
- Spring seat
07757·0010000
07959·KM30101
CYLINDER HEAD INSPECTION
CYLINDER HEAD
Disassemble the cylinder head (page 9-20).
USJJ
care
not to Remove the carbon deposits from the combustion
scratch the chamber or exhaust
port.
combustion
Check the spark plug hole and valve area for cracks.
chamber
or
head
gasket surface Replace the cylinder head if necessary.
SPRI NG SEAT
VALVE
,
,
,
COTTERS
="~~~~~
9-21