Service manual

3-22
CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
T
R
.
.
Compression pressure (at sea level)
Minimum
1262 kPa (12.6 kgf/cm
2
, 700r/min)
Standard
1450 kPa (14.5 kgf/cm
2
, 700r/min)
Maximum
1624 kPa (16.2 kgf/cm
2
, 700r/min)
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a. Set the main switch to “ON”.
b. With the throttle wide open, crank the en-
gine until the reading on the compression
gauge stabilizes.
w
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 J Eliminate.
d. If the compression pressure is below the
minimum specification, pour a teaspoonful
engine of oil into the spark plug bore and
measure again.
Refer to the following table.
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8. Remove:
8compression gauge
9. Install:
8spark plug
12.5 Nm (1.25 m • kg 9.0 ft • lb)
10.Connect:
8spark plug cap
11.Install:
8battery holder
8battery cover
Refer to “COVER AND PANEL”.
Compression pressure
(with oil applied into the cylinder)
Reading
Higher than without oil
Same as without oil
Diagnosis
Piston ring(s) wear or
damage J Repair.
Piston ring(s), valves,
cylinder head gasket or
piston possibly defec-
tive J Repair.