ENGINE
3-10
7. 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 compression gauge
stabilizes.
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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8. Install:
• Spark plug
9. Connect:
• Spark plug caps
10.Install:
• Rear cylinder covers
• Front cylinder covers
Refer to “ENGINE REMOVAL” on page 5-1.
EAS20750
CHECKING THE ENGINE OIL LEVEL
1. Stand the vehicle on a level surface.
NOTE:
• Place the vehicle on a suitable stand.
• Make sure the vehicle is upright.
2. Check:
• Engine oil level
The engine oil level should be between the
minimum level mark “a” and maximum level
mark “b”.
Below the minimum level mark → Add the
recommended engine oil to the proper level.
Compression gauge
90890-03081
Engine compression tester
YU-33223
Standard compression pressure
(at sea level)
1450 kPa/400 r/min (206.2
psi/400 r/min) (14.5 kgf/cm²/400
r/min)
Minimum–maximum
1200–1500 kPa (170.7–213.3 psi)
(12.0–15.0 kgf/cm²)
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, valves or cyl-
inder head gasket
possibly defective →
Repair.
T
R
.
.
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
Type
SAE20W40
Recommended engine oil grade
API service SG type or higher,
JASO standard MA
b
a
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