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ELECTRICAL
ELECTRICAL
CHECKING THE SPARK PLUG
1. Remove:
•Spark plug
2. Inspect:
•Electrode "1"
Wear/damage→Replace.
•Insulator color "2"
Normal condition is a medium to
light tan color.
Distinctly different color→ Check
the engine condition.
When the engine runs for many hours
at low speeds, the spark plug insula-
tor will become sooty, even if the en-
gine and carburetor are in good
operating condition.
3. Measure:
•Plug gap "a"
Use a wire gauge or thickness
gauge.
Out of specification→Regap.
4. Clean the plug with a spark plug
cleaner if necessary.
5. Tighten:
•Spark plug
•Before installing a spark plug, clean
the gasket surface and plug sur-
face.
•Finger-tighten "a" the spark plug
before torquing to specification "b".
CHECKING THE IGNITION TIMING
1. Remove:
•Timing mark accessing screw "1"
2. Attach:
•Timing light
•Digital tachometer
To the ignition coil lead (orange
lead"1").
3. Adjust:
•Engine idling speed
Refer to "ADJUSTING THE EN-
GINE IDLING SPEED" section.
4. Check:
•Ignition timing
Visually check the stationary
pointer "a" is within the firing
range "b" on the rotor.
Incorrect firing range→Check ro-
tor and pickup assembly.
5. Install:
•Timing mark accessing screw
Spark plug gap:
0.7–0.8 mm (0.028–
0.031 in)
Spark plug:
13 Nm (1.3 m•kg, 9.4
ft•lb)
Timing light:
YM-33277-A/90890-
03141
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