– 51 –
E
INSP
ADJ
GENERAL
MEASURING THE COMPRESSION
PRESSURE
WARNING
Before removing a spark plug, use com-
pressed air to blow away dirt accumulated
in the spark plug well to prevent it from
falling into the cylinder that is being tested.
Measure:
• Compression pressure
Excessive low compression pressure
→
Check the power unit components.
Compression pressure
(reference data)
650 kPa (6.5 kgf/cm
2
, 92 psi)
Measuring steps
(1) Start the engine and allow it to warm
up for several minutes.
(2) Stop the engine and remove the lock
plate from the engine stop lanyard
switch on the remote control box.
(3) Remove the all spark plugs (six spark
plugs).
(4) Install the compression gauge
1
into
the spark plug hole.
(5) With the throttle wide open, crank the
engine setting the main switch in the
START position until the reading on
the compression gauge stabilizes.
(6) Remove the compression gauge and
reinstall the all spark plugs.
Compression gauge
90890-03160
1
3237
Summary of Contents for Z150P
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