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IGNITION TIMING CHECK/
COMPRESSION PRESSURE MEASUREMENT
INSP
ADJ
NOTE:
NOTE:
CAUTION:
Ignition timing is not adjustable.
3. Install:
D Timing check plug
YP303060
COMPRESSION PRESSURE
MEASUREMENT
Insufficient compression pressure will result in
performance loss.
1. Remove:
D Side panels
Refer to “COVER AND PANEL” section.
2. Check:
D Valve clearance
Out of specification ! Adjust.
Refer to “VALVE CLEARANCE AD-
JUSTMENT” section.
3. Start the engine and let it warm up for sev-
eral minutes.
4. Turn off the engine.
5. Remove:
D Spark plug
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:
D Compression gauge
1
Compression gauge:
90890-03081
7. Measure:
D 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.