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Cylinder Head; Cylinder Compression Measurement; Cylinder Head Removal; Cylinder Head Installation Notes - Kawasaki KX125 1990 Service Manual

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Cylinder Head
Cylinder Compression M easurem
ent
-
Start
the
engine
-
Thoroughly warm up
the engine so that
the engine
oil
between the
piston
and cylinder wall
will help
seal
compre§sion
as
it
does
during normal
running.
-
Stop
the
engine.
-
Remove
the
spark
plug.
and screw
a
compression
gauge
(special
tool)
firmly into
the
spark plug
hole.
-
With the throttle fu lly
open,
tum
the
e
ngine
over
sharply
with the
kickstarte
r several times
until
the
compression gauge stops
rising; the
compression
is
the
highest
reading obtainable
.
CytInde< Compression (Usable
Rangel,
KX125
:
770
-
12OOkPa 17.7
-
12 kglcm
2
109-
171
pol)
KX250
:
840-
1300kPa 18.4
-
13 kglcm
2
119-
185
pol)
A.
Compression
Gauge:
57001-221
B.
Adapter:
57001-11
59
*
If
cylinder compression is
higher than
the
usable
range,
check
the
following:
1.
Carbon
build-up o
n
the
piston
head a
nd
cylinder
nead
- clean
off
a ny
carbon
o
n the
piston nead
and
cylinder
head.
2.
Cylinder
head
gasket,
cylinder
base
gasket
-
use
only the
proper gaskets for
the
cylinder
head a
nd
base.
The
use
of gaskets of
the
incorrect thickness
will
change
the
compression.
*
If cylinder
compression
is
lower
than the usable
range,
check
the
following:
1.
Pistonlcylinder
clearance,
piston
seizure.
2.
Gas leakage around
the
cylinder head -
replace
the damaged
gasket
and
c
heck the
cylinder
head
for
warping.
3.
Piston
ring,
piston
fing groove
.
ENGINE TOP ENO 4-7
Cylinder Head Removal
-
Drain
the
coolant
(see
Coolant
Change
in
the
Cooling
System
c
hapter).
-
Remove
the
fo
llowi ng
parts:
Radiator
Covers
Side Covers
Seat
Fuel
Tank
Muffler
Spark
Plug
Water
Hoses
A.
Spark Plug
B.
Water
Hoses
C.
Engine Mounting Bracket
-
Remove the
engine
mounting brackets on the
cylinder
head.
A.
Engine Mounting Brackets
-
Remo
ve
t
he cylinder head
nuts,
and take
off
the cylinder head
and gasket
Cylinder Head Installation
Notes
-Installation is
the reverse
of removal.
-
Replace the
head gasket with
a
new
one.
-
Scrape
out any
carbon
and clean the head
with
a
high
flas~
int
solvent
-
Check
fO/"
a
c
rust of
minerals and
rust in
the head
water
jacket,
and
remove
them
if
necessary.

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