4.
•
Install:
•
Crankcase filter element
•
Crankcase filter cover seal
Crankcase filter cover
COMPRESSION PRESSURE
MEASUREMENT
NOTE:
Insufficient compression pressure will result in
performance loss.
1.
•
Remove:
Side panels
2.
•
Check:
Valve clearance
Out of specification → Adjust.
3. Start the engine and let it warm up for sev-
eral minutes.
4. Turn off the engine.
5.
•
Remove:
Spark plug
CAUTION:
Before removing the spark plug, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug well to prevent it from
falling into the cylinder.
6.
•
Attach:
Compression gauge
1
7.
•
Measure:
Compression pressure
If it exceeds the maximum pressure al-
lowed → Inspect the cylinder head, valve
surfaces and piston crown for carbon de-
posits.
If it is below the minimum pressure →
Squirt a few drops of oil into the affected
cylinder and measure again.
Follow the table below.
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