Honda CRF450R 2009 Service Manual page 388

FRONT WHEEUSUSPENSIONfSTEERING
14-28
FORK SPRING ('09 • ' 12)
Measure the fork spring free length by placing it on a
flat surface.
SERVICE LIMIT; 451
mm
(17.8
in)
SLICER BUSHING/GUIDE BUSHING/BACK·UP RING
'09 · '12:
Check the slider and guide bushings for excessive wear r:c B- U~ S- H -'N -G ' ------------------'
or scratches.
If
copper appears on the surface, replace the slider and
guide bushings.
Replace the back-up ring
if
there is distortion al the
points shown.
Remove any metal powder from the fork slider and
guide bushings with a nylon brush and fork oil.
FORK DAMPER
Check the fork damper for bends or damage.
Check the piston rod for bends, wear or damage.
Check the fork damper operation by pumping the piston
rod.
If the operation is not smooth, fill the fork damper wi th
fork oil, and check. the fork damper operation again
(page
14-35).
BACK-UP RING
FORK DAMPER
PISTON ROD