Cylinder Head Disassembly/Assembly - Honda CB250N Shop Manual

Cylinder Head/Cyiirtder/Piston
Cylinder
Head
Disassembly/Assembly
CAUTION
To
prevent
loss of tension,
do
not
compress
the valve spring
more
than necessary.
NOTE
•
Mark
all
parts during
disassembly so they can be placed back
Their original positions.
Remove carbon
deposits
from
the
combustion chamber and
clean
oft
the head gasket surface, before
assembly.
—
Avoid damaging
the gasket surface.
.— Gaskets
will
come
off easier
soaked
in solvent.
.•
For valve guide replacement, see section 9
of
the
Common
Service Manual.
Requisite Service
•
Cylinder head
removal/installation
(page 7-10)
Procedure
Q'ty
Remarks
Disassembly Order Assembly
is in
the reverse order
of
disassembly.
(1)
1
Valve
spring cotter
8
NOTE
-
To prevent
loss of tension,
do
not
compress the valve
spring
more
than necessary.
(2)
Retainer 4
(3)
(4)
Outer valve spring
Inner valve spring
:t
-install
them
with the
narrow
pitch
end facing
down.
(5)
Inlet
valve
u -Apply
molybdenum
disulfide oil
solution
to
both
vaive
(6|
Exhaust valve
stems before
installing.
(7)
Valve stem
seal
4 NOTE
•
To
avoid
damage
to
stem
seal, turn
the vaive slowly
when
inserting.
(8)
Valve spring seet
4
<91
Valve guide
4
(10)
0-ring 4
7-11