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SUPPLEMENT-1980 22508 207
Maintenance
ROCKER ARMS, SHAFTS
The procedures
are
the same
as those for
the 1979
Z250-A
1 with
the
following exception.
Re.fer
to
Pg.
119.
Rocker arm/shaft wear
Table N5
Rocker Shaft Diameter
Service
Limit
12.94
mm
CAMSHAFT
The procedures
are
the
same
as those for
the
1979
Z250-A
1 with the following exception.
Refer to Pgs.
119~121.
Journal wear
Table N6
Camshaft Journal/Cylinder Head
Cover Clearance
Service Limit
0.20
mm
CYLINDER BLOCK, PISTONS
The procedures are
the
same as
those for the 1979
Z250-A 1
with
the
following
exception.
Refer
to
Pgs.
127
-130.
Piston ring, piston ring groove wear
Tbale N7
Piston Ring Thickness
Top
Ring
2nd Ring
Service
Limit
1.1
mm
1.1
mm
Table NS
Piston Ring Groove Width
I
Top Ring
l
2nd Ring
Service
Limit
I
1.3 mm
l
1.3 mm
Table N9
Rim, Spoke Size
Spoke
Inner
WHEELS
The
procedures are the same
as those
for the 1979
Z250-A 1
with
the
following exceptions.
Refer
to Pgs.
140
~
143.
Rim, Spokes
The
rim
of each wheel is made of steel and is
con-
nected to
the hub by
the spokes. A rim band around
the
outside center of the
rim
keeps the tube from
coming into direct
contact
with the spoke
nipples.
Since
the
spokes must
withstand repeated stress,
it is important to
take
sufficient care
t
hat
the spokes
are not allowed
to loosen
and that
they are
tightened
even
ly
.
Loose or unevenly
tightened spokes cause the
rim
to warp, increase
the possibility of
spoke
breakage,
and hasten nipple
and spoke
metal fatigue.
NOTE:
The rim size shown
in Table N9
is
the
outer
width and diameter,
both in inches.
The spoke size
is
diameter number
by length
in millimeters.
The two
numbers
for
diameter
size
mean
that
each
spoke
has
two
diameters.
To
make the
spoke
more
resistant to
break-
age
the diameter is
greater near the
hub.
Spoke breakage
If
any
spoke breaks,
it
should
be replaced immediate-
ly.
A missing spoke
places an
additional
load
on
the
other
spokes,
which will
eventually
cause
other spokes
to
break.
Periodically
check
that
all
the spokes
are
tightened
evenly since
they
stretch
a
certain amount during use.
Standard
spoke
tightening torque is
0.30 kg-m
(26 ft-lbs).
Over-
or under-tightening
may cause
breakage.
Rim runout
Set
a
dial
gauge
against
the side of
the
rim,
and
rotate
the wheel
to
measure
axial runout.
The difference
be-
tween the
highest and lowest
dial
readings
is the
amount
of
runout.
Set the
dial
gauge against
the inner
circumference of
the
rim,
and rota'te
the
wheel
to
measure
radial
runout.
The difference between
the
highest and lowest
dial
readings
is
the
amount
of runout.
Outer
Rim
Front
#9
x 147.5 x
103°
#9
x 147.0
x 86°
1.60
x
18
Rear
#8
x
#9
x
155.5 x 102°
#8 x
#9 x 154.5
x
84°
1.85
x
18

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Kz350 1981

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