Yamaha Scorpio - Spark Plug Inspection; Compression Pressure Measurement

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INSP
ADJ
SPARK PLUG INSPECTION/
COMPRESSION PRESSURE MEASUREMENT
EB303040
SPARK PLUG INSPECTION
1.Check:
●
Spark plug type
Incorrect
→
Replace.
Standard spark plug:
D8EA (NGK),
X24ES-U (DENSO)
2.Inspect:
●
Electrode
1
Wear/damage
→
Replace.
●
Insulator
2
Abnormal color
→
Replace.
Normal color is a medium-to-light tan color.
3.Clean:
●
Spark plug
(with spark plug cleaner or wire brush)
4.Measure:
●
Spark plug gap
a
(with a wire gauge)
Out of specification
→
Adjust gap.
Spark plug gap:
0.6 ~ 0.7 mm
COMPRESSION PRESSURE
MEASUREMENT
N
OTE:
Insufficient compression pressure will result in
performance loss.
1.Start the engine and let it warm up for sev-
eral minutes.
2.Turn off the engine.
3.Remove:
●
Spark plug
4.Attach:
●
Compression gauge
1
Compression gauge:
90890-03081