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122 MAINTENANCE-ENGINE
Plastic Measuring Plate
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3.
Obtain
a
burette
or
syringe which
is
calibrated at
one-cc or smaller graduations. Fill
it
with oil.
Prior to the
combustion
chamber
volume measure-
ment,
clean off
any
carbon
in
the combustion chamber,
and
remove
any gasket flakes on
the
cylinder head
mating surface.
The
standard
spark plug should
be
installed in
the
charpber to be
measured
.
NOTE: The
valves
must seat well to prevent
the
oil
from leaking out.
Apply a
thin
coat of grease
to the
cylinder
head
mating surface and
place
the plastic plate over the
cylinder head
combustion
chamber,
fitting its
small
hole near the
edge
of
the
combustion chamber.
Place the cylinder head on
a level
surface. Through
the large hole,
fill
the combustion chamber
with light
oil
such as 2-strok; oil until
the
chamber
is
completely
but not
overly
filled.
Tilt
the cylinder
head
slightly
so
that
air bubbles come
out
through the small
hole.
The oil should
just
rise to
the bottom
edge of the
holes
in the
plate.
The amount
of
oil used
to
fill the
chamber is
the
combustion
chamber
volume.
Table H16
Combustion Chamber
Volume
Standard
17.5~18.3 cc
If
the combustion chamber
volume is too
small,
it
is
possible that the
cylinder head
was
modified
for
higher
compression.
Make
su re
that
all carbon
deposits
have been
cleaned
out
of the chamber.
If
the combustion
chamber volume
is
too
large,
it
is
possible that the valves and
valve
seats
have been
resurfaced
so much that the
volume
is
increased.
Make
su
re
that
the
spark
plug is the standard type and
that
it is
fully
tightened
.
Valve, Valve Guide,
Valve
Seat
Valve inspection
Visually
inspect the valve face, and
repl
ace
the
valve
if it shows
deformation
or uneven wear.
Measure the thickness
of
the valve
head
using vernier
caliper,
and replace the
valve if the thickness is under
the
service
limit.
Valve
Shape
Do
not
grind off
more than 0.2 mm.
' ' . ¥
: -
-r-~J
-
-r
Dimension
"A"
-~
A,=Minimum 4.1 mm
after grinding
Valve Head
Thickness

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Table of Contents

   Also See for Kawasaki Z250 1981

This manual is also suitable for:

Kz350 1981

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