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Kawasaki Z250 1981 Service Manual Page 129

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Table of Contents
Table
H17
Valve
Head Thickness
Standard
Service
Lim
it
IN
0.55- 0.85 mm
0.4 mm
EX
0.85
-
1.15 mm
0.5 mm
If
the seating su rface
of
the
valve or the end
of
the
valve
stem
is
damaged
or
badly
worn, repair the
valve
with a valve
refacer. The
angle of
the seating
surface
is
45° (Fig. H25).
[ CAVJ·T:Ji"tJN1
If the valve stem is ground down, be
-~~.!:_-~- ; ~
sure
to leave
at least 4.1 mm of stem
end above the wide groove portion.
Valve
Stem
Grinding
Valve Refacer
Position the
valve in
V
blocks
at each end of
the
straight portion of the
stem,
and set
dial
gauge against
the center of
the
stem. See the
example shown
in
Fig.
H27.
Turn ing
the
valve,
read the
variation
in
the
dial gauge.
Rep
lace
the
valve
if
it is bent
more
than
the
service limit.
Valve
Stem
Bend
Table H18
Valve Stem Bend
Standard
Service Limit
under
0.01 mm
0.05 mm
MAINTENANCE-ENGINE 123
Measure
the diameter of the valve
stem with a
micro-
meter.
Since
the
stem wears
unevenly,
take measure-
ments at
four
places up
and
down
the stem, keeping
the
micrometer at
righ
t
angles
to the
stem.
Repldce the
va lve
if the stem is worn to less than
the
service limit.
Table H19
Valve Stem Diameter
Standard
Serv ice
Limi
t
Inlet
5.495-5.510 mm
5.44 mm
Exhaust
5.480-5.495 mm
5.42
mm
Valve guide inspection
Remove the
valve,
and measure the
inside
diameter
of
the valve
guide
using a
small
bore gauge and micro-
meter.
Since the guide
wears unevenly,
measure
the
diameter at four
places
up and
down
the.
guide.
If
any
measurement exceeds the service
limit, replace
the
guide.
A. Bore Gauge
Table H20
Valve Guide Inside Diameter
Standard
Serv ice
Limit
5.520-5.532 mm
5.6
mm
If
a
small
bore gauge
is
not
available,
inspect the
valve
guide
wear
by measuring the
valve
to
valve guide clear-
ance
with
the
wobble
method, as
indicated
below.

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Kz350 1981

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