6. Measure:
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the engine
WARNING
EWA12960
To prevent sparking, ground the spark plug
lead before cranking the engine.
NOTE:
● Make use the battery is fully charged when tak-
ing measurements.
● Make sure there is no compression leakage
from the connecting section of the compres-
sion gauge.
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.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
7. Install:
● Spark plug
8. Connect:
● Spark plug cap
EAS20730
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. Start the engine, warm it up for several min-
utes, and then turn it off.
3. 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
1200 kPa (12.0 kg/cm
2
/300 rpm)
Minimum compression pressure
1050 kPa (10.5 kg/cm
2
/300 rpm)
Maximum compression pressure
1300 kPa (13.0 kg/cm
2
/300 rpm)
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, cylinder
head gasket or pis-
ton possibly defec-
tive → Repair.
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)
T
R
.
.
a
b
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