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Valve/Valve Seat Contact Area
Good
Cutting Angle of
Valve
Seat
~
- -
-
75°
4~0
r-:,
!
I
/
Too Wide
Apply compound to
the valve seat, and
tap
the valve
lightly into
place while rotating
it with
a lapper, re-
peati
ng
this
until
a
smooth, matched surface
is obtained.
A. Lapper
When lapping
is
completed, be sure to mark each
valve
so
it will be
properly
matched
to
its corresponding
valve seat
du ring
assembly.
Valve
Installed
Height
The valve
clearance
adjusting screw,
installed in
the
rocker
arm,
is
used
to
adjust the
valve clearance. There
is,
however,
a
limit to
the amount of
adjustment
possible
turning the adjusting
screw.
Resurfacing of the
valve
MAINTENANCE-ENGINE
125
Too Narrow
Uneven
face
and valve seat inevitably
drops
the valve deeper
into the valve
seat,
allowing
the
valve stem
end
to
come
closer
to the adjusting screw. Consequently,
the
adjust·
ing
screw
must
be
turned out to compensate
for
the
reduced
valve
clearance.
If
the
valve seat, face, and/or
stem end are resurfaced, measure
the installed valve
height from the cylinder head upper
surface
which the
valve
guide
contacts with
to the
end
of the valve stem
with a vernier
caliper before assembling the
cylinder
head.
Refer to Table H23
for the
recommended repair.
Over a period of
long
use and
repeated
resurfacing,
the
valve
may drop so
far
into
the valve seat that even
the
adjusting screw cannot
give
adequate clearance. In
this
case,
it
is possible
to
grind the end of
the
valve
stem
to
reduce
the valve installed
height and so
gain
the
needed
clearance (See
Cau
tion
in
Pg. 123).
If the
valve
drops so
far
into
the valve
seat
that
the
installed
height becomes quite
large,
either
by
a re·
su rfacing
error
or
heavy
wear, it
may be
necessary
to
replace the
valve
and
remeasure the
installed
height.
If this
is
not successful,
it wil
l
be
necessary to
replace
the
cyl inder
head. Replacement
valve
seats
are
not available.
Valve Stem Height
Installed Valve
Stem
Height
.
...........
'
..
.
.....
.
.
.
.
.
.
.
.
.
.
.
.
.
. .
. . .
.
...
.
...
...
.
.
..
'
.
..
.

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   Also See for Kawasaki Z250 1981

This manual is also suitable for:

Kz350 1981

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