EA$1AC1506
ENGINE INSPECTION
EA$20110
MEASURING THE COMPRESSION
PRESSURE
The fo
ll
owing procedu
re
applies to all of t
he
cyl-
inders.
TIP
-------------:--
lnsuffic
ie
nt compression pressure will res
ul
t in a
loss
of
performance.
1. Measure:
• Valve clearance
Out of specification
-+A
dj
ust.
Refer to "AD
JUS
TING THE VALVE CLEAR-
ANCE"
on
page 3·5.
2. Start the engine, warm it up for several min·
utes, and then
tu
rn it off.
3. Remove:
• Ri
der
seat
Refer to "GENERAL CHASSIS" on page 4·
1.
• Fuel tank
Refer to "FUEL TANK" on page 7-
1.
• Air filter case
Refer to "GENERAL CHASSIS" on page 4-
1.
• Air cut-o
ff
va
l
ve
Refer to "AIR INDUCTION SYSTEM"
on
page 7
-1
5.
• Ignition coils
•
Spar1<
plugs
Refer to "CAMSHAFTS"
on
page 5·9.
NOTICE
___________
_
Before
removing
the
spark
plugs
,
use
com·
pressed
air
to
blow
away
any
dirt
accumulat·
ed
in
the
spark
plug
wells
to
prevent
it
from
falling
into
the
cylinders.
4. Install:
• Compression gauge "1"
• Extension "2"
Compression
gauge
90890-03081
Engine
compression
tester
YU-33223
Extension
90890-04136
5-1
ENGINE INSPECTION
1
2
5.
Measure:
• Compression pressure
Out
of
specification
-+
Refer to steps (c) and
(d).
Standard
compression
pressure
(at
sea
level)
1530 kPa/680
r/min
(15.3
kgf
/cm
2
/680 r/min, 217.6 psi/680
r/min)
Minimum-maximum
1330-171 O kPa/680
r/min
(13.3-17.1
kgf/cm
2
/680
r/min
,
189.
2-243.2
psi/680 r/
min)
• •••••••••••••••••••••••••••••••
a.
Set
the main switch to "ON".
b.
Wi
th
t
he
throttle w
id
e open, crank the engine
unt
il the reading on the compression gauge
stabilizes.
A WARNING
To
prevent
sparking
the
plug,
remove
all
ig-
nition
coil
couplers
and
fuel
injector
cou-
plers
before
cranking
the
engine
.
TIP
-------------
The di
ff
erence in compression pressure be-
tween cylinders sho
ul
d not exceed 100 kPa
(1
kg/cm
2
,
15
ps
i).
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
-+
Eliminate.
d. If the compression pressure is bel
ow
t
he
min-
imum specific
at
ion, pour a teaspoonful
of
en-
g
in
e o
il
in
to t
he
spark pl
ug
bore and measure
again.
Reier to t
he
followi
ng
table.
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