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CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
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
_
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
Piston ring(s) wear
or damage →
Repair.
Same as without
oil
Piston, valves,
cylinder head
gasket or piston
possibly defective
→ Repair.
T
R
.
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11 Nm (1.1 m · kg, 8.0 ft · lb)