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CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
6. Install:
• compression gauge adapter 1
• compression gauge 2
7. Install:
• fuel tank
8. Measure:
• compression pressure
Out of specification → Refer to steps (c)
and (d).
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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.
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 gauge
90890-03081
Compression gauge adapter
90890-04136
Compression pressure (at sea
level)
Minimum
1,390 kPa (13.9 kg/cm
2
, 13.9 bar)
Standard
1,600 kPa (16.0 kg/cm
2
, 16.0 bar)
Maximum
1,790 kPa (17.9 kg/cm
2
, 17.9 bar)
