60H5E11
5
Power unit
Checking the compression pressure
1. Start the engine, warm it up for 5 minutes,
and then turn it off.
2. Remove the lock plate for the engine stop
switch on the remote control box.
3. Remove all spark plugs, and mount the
compression gauge on spark plug hole.
Clear out the area around the spark plugs
before removal, to prevent any dirt or dust
from falling into the cylinder bore.
4. Fully open the throttle valve and the choke
valve, keep cranking the engine until the
reading on the compression gauge stabi-
lizes, and then check the compression
pressure.
60H50010
Compression gauge:
90890-03160
Minimum compression pressure
(reference data):
520 kPa (5.2 kgf/cm
2
, 75.4 psi)
5. If the measured compression pressure is
below specification, or it varies among the
cylinders, add a small amount of engine oil
to the cylinder, and check the pressure
again.
NOTE:
• If the compression pressure increases, check
the piston, piston rings and cylinder bore for
wear. Replace them if necessary.
• If the compression pressure does not change,
check the cylinder head gasket and cylinder
head. Correct or replace them, if necessary.
5-2
Special service tools / Power unit
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