Spark Plug Inspection - Yamaha EF1000iS Owner's Manual

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AE01026

SPARK PLUG INSPECTION

The spark plug is an important engine component,
which should be checked periodically.
1. Remove the cover, and then remove the spark
plug cap.
760-025
1 Cover
2. Remove the spark plug with a tool.
3. Check for discoloration and remove the carbon.
The porcelain insulator around the center elec-
trode of spark plug should be a medium-to-light
tan color.
760-024
4. Check the spark plug type and gap.
Standard spark plug:
CR4HSB (NGK)
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
760-001a
a Gap
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
5. Install the spark plug.
Spark plug torque:
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
TIP
If a torque wrench is not available when installing a
spark plug, a good estimate of the correct torque is
1/4-1/2 turn past finger tight. However, the spark plug
should be tightened to the specified torque as soon as
possible.
6. Install the spark plug cap, and then install the
cover.
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