ENGINE
3-10
5. Disconnect:
• Spark plug cap
6. Remove:
• Spark plug
CAUTION:
ECA13340
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.
7. Install:
• Compression gauge “1”
• Extension “2”
8. Measure:
• Compression pressure
Out of specification → Refer to steps (c) and
(d).
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
WARNING
EWA12940
To prevent sparking, ground all spark plug
leads before cranking the engine.
NOTE:
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
kg/cm², 14 psi).
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 below the min-
imum specification, pour a teaspoonful of en-
gine oil into the spark plug bore and measure
again.
Refer to the following table.
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9. Install:
• Spark plug
10.Connect:
• Spark plug cap
11.Connect:
• Decompression solenoid couplers
12.Install:
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Seat
Refer to “GENERAL CHASSIS” on page 4-1.
Compression gauge
90890-03081
Engine compression tester
YU-33223
Extension
90890-04082
Standard compression pressure
(at sea level)
1200 kPa/200 r/min (170.7
psi/200 r/min) (12.0 kgf/cm²/200
r/min)
Minimum–maximum
1000–1400 kPa (142.2–199.1 psi)
(10.0–14.0 kgf/cm²)
1
2
1
Compression pressure (with oil applied into
the cylinder)
Reading Diagnosis
Higher than without
oil
Piston ring(s) wear or
damage → Repair.
Same as without oil
Piston ring(s), valves,
cylinder head gasket
or piston possibly
defective → Repair.
T
R
.
.
Spark plug
18 Nm (1.8 m·kg, 13 ft·lb)
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