G
1700·G 1800·G
1900·G2000
WSM.
10830
5.1
ENGINE
[2] ENGINE BODY
CHECKING AND ADJUSTING
Compression Pressure
1.
Run
the
engine
until
it
is
warmed
up.
2.
Stop
the
engine, and disconnect
the
2P
connector
from
the
fuel pump.
3.
Remove
all spark plugs, and set a compression tester (Code
No.
07909-30251)
with
the
adaptor
to
the
spark
plug
hole.
4.
Fully open
the
throttle
valve.
S.
While cranking
the
engine
with
cell
starter,
measure
the
compression pressure.
6.
Repeat steps 3
through
5
for
each cylinder.
7.
If the measurement does
not
reach
the
allowable
limit.
apply
a small
amount
of
oil
to
the
cylinder wall
through
the spark
plug hole and measure
the
compression pressure again
8.
If the compression pressure
is
still
less
than
the
allowable
limit, check
the
top
clearance, valve and cylinder head.
9.
If
the
compression pressure increases
after
applying
oil,
check
the
cylinder
wall
and piston rings .
• NOTE
•
Check
the
compression pressure
with
the
specified
valve
clearance.
• Always use a
fully
charged
battery
for
performing
this
test.
• Variances
in
cylinder compression values
should
be
under
10%.
Compression pressure
Factory spec
1.27 MPa
130
kgflcm2
185
pSI
Allowable
limit
0.88
MPa
9.0
kgflcm2
128
psi
B083
F066
C067F039
TOp
Clearance
1.
Remove
the
cylinder head (Do
not
remove
the
cylinder head
gasket).
2.
Move
the
piston
up
and stick
four
strips
of
fuse [diameter:
1.5
mm
(0.059 in.),
length:
5
to
10
mm
(0.197
to
0.394 in.)] on
the piston head
(see
figure)
with
grease.
3.
lower
the
piston, and install
the
cylinder head and
tighten
the cylinder head screws
to
the
specified
torque
(37.3
to
42.2
N'm,
3.8t04.3
kgf'm,
27.5
to
31.1
ft-Ibs).
4.
Turn
the
flywheel
until
the
piston
is
raised and
lowered
again.
5.
Remove
the
cylinder head and measure
the
thickness
of
the
fuses.
6.
If
the
measurement
is
not
within
the
factory
specifications,
check
the
oil clearance
between
the
crank
pin
and crank pin
bearing, and
the
oil clearance
between
the
piston pin and
small end bushing.
0.85
to
1.30
mm
TOp
clearance
Factory spec.
0.0335
toO
0511m
.
•
•
NOTE
When reassembling
the
cylinder head, be
sure
to
replace
the
cylinder head gasket
with
a
new
one.
S.1-57
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