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4. Check:
• Electrode "1"
Damage/wear → Replace the spark plug.
• Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• Spark plug gap "a"
(with a wire thickness gauge)
Out of specification → Regap.
Spark plug gap
0.7–0.8 mm (0.028–0.031 in)
7. Install:
• Spark plug
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
TIP
Before installing the spark plug, clean the spark
plug and gasket surface.
8. Connect:
• Spark plug cap
EAS20700
CHECKING THE IGNITION TIMING
TIP
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
1. Remove:
• Timing mark accessing screw "1"
2. Connect:
• Timing light "1"
• Digital tachometer
1
3. Check:
• Ignition timing
M
MMM
M MMM
M
M MMM
M
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
Engine idling speed
1400–1600 r/min
b. Check that the stationary pointer "a" on the
generator cover is within the firing range "b"
on the generator rotor.
Incorrect firing range → Check the ignition
system.
ENGINE
1
M MMM
M
M MMM
M
M MMM
M
b
b
MMM
a
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