Spark Plug Inspection - Yamaha EF6300iSDE Owner's Manual

a

Spark plug inspection

The spark plug is an important engine component,
which should be checked periodically.
2
1
1. Remove the screws, and then pull outward on the
areas of front cover shown.
788-7CKa
1 Screws
2 Front cover
2. Remove the spark plug cap and then remove the
spark plug.
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.
760-7XF
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
a Gap
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
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