Spark Plug Inspection - Yamaha EF2400iSHC Owner's Manual

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AE01051

SPARK PLUG INSPECTION

The spark plug is an important engine component,
which should be checked periodically.
1. Remove the screws 1 and side cover 2.
1
788-014
2. Remove the spark plug cap 3 and the spark plug.
3
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.
760-031
4. Check the spark plug type and gap
Standard spark plug:
BPR4ES (NGK)
Spark plug gap
0.7–0.8 mm (0.028–0.031 in)
760-001a
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:
20 Nm (2.0 m·kgf, 14 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.
7. Install the side cover and tighten the screws.
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