Honda CRF450R 2012 Service Manual

---------- -------------- -----------
CYLINDER HEADIVALVES
Adjust the valve guide driver to the valve guide
height.
While the cylinder head is still heated, drive new
valve guides into the cylinder head from the top of
the cylinder (ca mshaft and rocker a rm side).
Check that the valve guides are at the proper depth
using a ca liper. adjust the height if necessary.
SPECIFIED DEPTH :
IN: 16.1 - 16. 3mm(O . 63 - 0. 64in)
EX : 17.9 - 18.1 mm (0.70 - 0. 71 in)
TOOL:
Valve guide driver
07743 · 0020000
not available in
U.S.A.
Let the cylinder head cool to r oom temperature.
Use curringoiJon Ream new valve guides.
the reamer during Insert the reamer from the comb ustion cha mbe r
this operation. side of the cylind er head and always rotate the
Take care not to tilt reamer clockwise.
or lean the reamer
In the guide while
(eaming.
TOOLS:
IN: Valve guide reamer, 5.5 mm
EX : Valve guide reamer, 5.0 mm
07984-2000001 or
07984-2000000
(U.S.A.
onlv)
07984-MA60001 or
07984·MA6000D
(U.S.A. onlv)
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve
seats (page
9-30).
VALVE SEAT INSPECTION/REFACING
9-30
Clean the intake and exhaust valves thoroughly to
remove carbon deposits.
Apply l ight coating of Prussian Blue to the va lve
seat.
Tap the valves and seats using a rubber hose or
other hand ·lapping tool.
Remove the valve and inspect the valve seat face.
The val
ve seat contact should be wi thin the speci-
fied width and even all ar oun d the circumfe ren ce.
STANDARD:
IN: 1.1 - 1.3 mm (0. 04 - 0. 05 in)
EX:
1.3 - 1.5 mm (0. 05 - 0.06 in)
SERVICE LIMIT:
IN/ EX : 2.0 mm (0.08 in)
If the seat width is not within specification, reface
the valve seat (page 9-31 ).
f --- , "
, , ."'
, " , ,
,
SEATWfDTH
•
•

Honda CRF450R 2012 Specifications

General

Brand	Honda
Model	CRF450R 2012
Category	Motorcycle
Language	English