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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.
To prevent sparking, ground the 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, squirt a few drops of
oil into the cylinder and measure again.
Refer to the following table.
7. Install:
• spark plug
8. Connect:
• spark plug cap
Compression pressure
(with oil applied into the cylinder)
Reading
Diagnosis
Higher than
without oil
Pistonring(s) wear or
damage → Repair.
Same as without oil
Piston, valves, cylinder
head gasket or piston
possibly defective →
Repair.
T
R
.
.
11 Nm (1.1 m
•
kg, 8.0 ft
•
Ib)
MEASURING THE COMPRESSION PRESSURE/
CHECKING THE ENGINE OIL LEVEL
1. Place the machine on a level surface.
2. Check:
• engine oil level
Oil level should be between the maximum
mark and minimum
mark.
Oil level low → Add oil to the proper level.
Do not screw the dipstick
in when checking
the oil level.
1
CHECKING THE ENGINE OIL LEVEL
CHK
ADJ
WARNING
a
b
TIP
a
b
1
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