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Kawasaki Z250 1981 Service Manual Page 127

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Table of Contents
Chain Guide Rubber Wear
Table H13
Camshaft Chain Guide Wear
Serv ice
Limit
Front
1.4
mm
Rear
2.3 mm
Chain tensioner inspection
Remove the camshaft
chain
tensio
ner.
Visually
inspect the
push
rod, and check
that
it moves
smoothly
in the guide,
with
the spring
removed.
If there
is
any
damage
or
abnormal operation, replace the
tensioner
with
a
new
one.
Measure the
spring free length
.
Replace
the
spring
if the free length exceeds
the service
limit.
Table
H14
Chain Tensioner Spring Free Length
Standard
Service
Limi
t
about
44.2
mm
42 mm
CYLINDER HEAD, VALVES
Cylinder Head
Cleaning and inspection
Remove the cylinder
head
(Pg.
48) and
valves
(Pg.
50).
Scrape out
any
carbon, and wash the head with
a
h
igh
flash-point
solvent.
MAINTENANCE-ENGINE 121
Cylinder head warp
Lay
a straightedge across the lower surface of the
head
at
several
diffe rent
points,
and measure warp
by.
inserting
a thickness gauge
between
the
straightedge
and the
head.
If warp
exceeds the
service
limit,
repair
the
mating surface.
Replace the
cy
linder
head if the
mating
surface is badly damaged.
A. Straightedge
B.
Thickness Gauge
Table H15
Cylinder Head Warp
Service Limit
under 0.05 mm
Combustion chamber volume measurement
The
combLtstion chamber
volume should
be measured
any
time
that compression
measurement
results
in
com-
pression pressures
well
below or above
the
standard.
NOTES:
1.
Another person will be
needed
to
help
expel
air
bubbles
out of the combustion
chamber.
2. Prepare a piece of transparent
plastic plate wh ich
has
a flat surface and two
holes
about 35
mm
apart in
its
center
portion.
One hole
sh
ou
ld
be
about
6 mm
in
diameter,
the
other
about 3 mm
in
diameter.
The plate
must
be oil-resistant,
about
120 mm sqLiare,
and at
least
3 mm
thick.

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Kz350 1981

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