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ENGINE
3-9
4. Remove:
• Spark plug
ECA13340
Before removing the spark plug, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug wells to prevent it
from falling into the cylinder.
5. Install:
• Compression gauge “1”
• Extension “2”
6. Measure:
• Compression pressure
Out of specification → Refer to steps (c)
and (d).
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a. Set the main switch to “ON”.
b. With the throttle wide open, crank the
engine until the reading on the compres-
sion gauge stabilizes.
WARNING
EWA4D3F002
To prevent sparking, ground spark plug
lead before cranking the engine.
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
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
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7. Install:
• Spark plug
8. Connect:
• Spark plug cap
EAS28920
CHECKING THE ENGINE OIL LEVEL
1. Place the vehicle on a level surface.
2. Start the engine, warm it up for several
minutes, and then turn it off.
3. Check:
• Engine oil level
The engine oil level should be between
the minimum level mark “a” and maxi-
mum level mark “b”.
Below the minimum level mark → Add the
recommended engine oil to the proper
level.
TIP
• Before checking the engine oil level, wait a
few minutes until the oil has settled.
Compression gauge
90890-03081
Engine compression tester
YU-33223
Extension
90890-04082
Standard compression pressure
(at sea level)
Standard
1100 kPa/720 r/min (11.0 kgf/
cm
2
/720 r/min, 156.5 psi/720 r/
min)
Maximum
1300 kPa/720 r/min (13.0 kgf/
cm
2
/720 r/min, 188.6 psi/720 r/
min)
Minimum
900 kPa/720 r/min (9.0 kgf/
cm
2
/720 r/min, 130.5 psi/720 r/
min)
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, valves, cylin-
der head gasket or
piston possibly defec-
tive → Repair.
Spark plug
18 Nm (1.8 m·kg, 13 ft·lb)