Honda CRF450R 2009 Service Manual page 271

Support the cylinder
Tap the valve stems gently with plastic hammer and
head above the
shaft as shown to seat the cotters firmly.
worle bench surface
to prevent possible
valve damage.
Inslall the insulator to the cylinder head by aligning the
groove of the insulator with the tab of the cylinder head.
NOTE:
Inslall the insulator with its ~TB UP" mark facing toward
the throttle body side.
Align the insulator band hole with the insulator tab.
Tighten the insulator band screw to the specified range
as shown .
Install a new a-ring to the water hose joint.
Install the water hose jOint to the cylinder head.
Inslall and tighten the bolt securely.
Install the following:
- EeT sensor (page 6-73)
- Spark plug (page 4-12)
- Cylinder head (page 9-30)
'09 shown:
CYLINDER HEADNALVES
SHAFT VALVE
w-__
WORKBENCH
"TB
up·
MARK
INSULATOR
'09 - '12:
7,0± 1.0mm
(0,28:t 0,04 in)
After'12:
4,0 ± 1,0 mm
(0,16
:t
0,04 in)
9-29