Service manual

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CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
5.Install:
• compression gauge 1
Compression gauge
90890-03081
Adapter
90890-04136
6.Measure:
• compression pressure
Out of specification → Refer to steps
(c) and (d).
▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the
engine until the reading on the com-
pression gauge stabilizes.
WARNING
WARNING
To prevent sparking, ground all spark
plug leads before cranking the engine.
NOTE:
The difference in compression pressure
between cylinders should not exceed
100 kPa (1 kg/cm
2
, 1 bar).
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.
Compression pressure (at sea
level)
Minimum
1,350 kPa (13.5 kg/cm
2
,
13.5 bar)
Standard
1,450 kPa (14.5 kg/cm
2
,
14.5 bar)
Maximum
1,500 kPa (15.0 kg/cm
2
,
15.0 bar)