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30
3.
ENGINE
Fig. 3.
46
Valve seat
LEF
T
SIDE
Fig
.
3.
47
Valve
spring parts
combinatio
n
Fig
.
3.
48
Assembl
e
val
ve
spring on
the head
©
Torsion bar outer
arm
®
Torsion
bar
valve
spring
4.
Valve seat
The valve seat
is
repaired with
three
typ
es of
cutter :
valve
seat
surface cutte r,
valve
seat in-
terior cutter and valve seat 90
°
cutter.
The relative
locat
ion
and the
width
of the
valve
seat contact area
is accomplished w
it
h
the
valve seat surface
cutter
,
and va lve
seat
90°
cutter
,
while the
refacing
of
the
va
lve
contact
area is
preformed by
the
valve
seat
interior
cutter
(Fig. 3. 46).
Valve lapping op eration is
performed
last, this
is to
obtai
n a
leak
proof
seal betw
een
the valve
and
the valve
seat.
Place a
liberal
amount of
lapping
compound
on
the
valve
face and lap
the
valves,
app
lyi
ng a
slight
pressure while rot at-
ing the valve
bock
and
forth with
a
suction
cup
lapping
tool.
Wash off
the compound thoroughly
and
inspect
the
valve
seat with
bluing.
5.
Inspect the
torsion
bar
valve
spring fo
r
cracks
and
rust.
CAUTION:
Use
the valve seat
grinder
(tool No.
07782-
0020000,
A
sell
to
correct the
valve seat width
and
contact
from the
following serial
num
ber.
CB450E-
504294l--
CB450E-602l254,_,
Rea
d caref ully
the instruction provided
w
ith
the
valve seat
gri nder.
M.
Valve and Torsion
bar
valve spring
Reassembly
l.
Assemble the torsion bar
valve
spring and the
outer
.
NOTE:
There
are two
types
of torsion
bars, therefore,
make sure
that
the
tori on
bars
are
not
inter-
changed.
(Fig.
3. 47)
2
.
Assemble
the torsion bar valve spring
into
the
cylinder
head.
Assemble
the
oute
r
arm
on
the
inside
and
the
torsion bar valve
spring
assem-
bly from the outside.
(Fig.
3. 48)
NOTE:
Make certain
that
the
assemblies are
installed
in
their
proper
places.
(Fig. 3.
47)
3.
Assemble
valve
into the
head
NOTE
:
a.
After
assemb
ly,
check
to
make sure
that
the
valve stem
and the
fork of
the outer
arms
is
not
binding.
If
they
are binding, the
valves
stem
may be
bent.
b.
The guide
seal
cap
should
not be
loose.
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