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AE01051
Spark plug inspection
The spark plug is an important engine component,
which should be checked periodically.
1. Remove the side cover screws and the side cover.
1
1 Side cover screw
788-014
2 Side cover
3
2. Remove the spark plug cap and the spark plug.
3 Spark plug cap
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
760-031
tan color.
4. Check the spark plug type and gap.
a Spark plug gap
Standard spark plug:
BPR4ES (NGK)
760-001a
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
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 tightening 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 side cover
screws.
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