Honda CRF450R 2009 Service Manual page 254

CYLINDER HEADNALVES
If the camshan
contact surface of
the rocker arm
Is
damaged or
abnormaHy
worn,
check. the
cam
lobes for damage
(page9·13).
9·12
INSPECTION
ROCKER ARM
Inspect the camshaft contact surface of the rocker arm
for wear or damage.
Inspecllhe rocker arm oil passage for clogs.
Measure the rocker arm 1 .0 .
SERVICE LIMIT: 12.025 mm (0.4734
in)
ROCKER ARM SHAFT
Inspect the rocker arm shaft for wear or damage.
Measure the rocker arm shaft
0.0.
SERVICE LIMIT: 11 .97 mm (0.471 in)
Calculate the rocker arm-to-shaft clearance.
SERVICE LIMIT: 0.055 mm
(0.0022 in)
CAMSHAFT
L
L
Turn the ouler race of the camshaft bearings with your
r:-:--
'09 shown:
finger.
The bearing should turn smoothly and quielly,
Also check that the bearing inner race fils tightly on the
camshaft.
Replace the camshaft assembly if the cam sprocket
side bearing does not turn smoothly, quietly or if they fit
loosely on the camshaft.
Replace the decompressor side bearing
if
it does not
turn smoothly, qulelly or
if
they
fit
loosely on the
camshaft (page 9-13).
Check the cam sprocket teeth for wear or damage.
F 09
h
sown:
Check the
cam lobe surfaces for scoring or evidence of
insuffICient lubricant.