Yamaha EF6300iSDE - Spark Plug Inspection and Maintenance

4. Check the spark plug type and gap.
a Gap
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
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.
– 29 –
760-7XF
a
760-001a
Spark plug inspection
The spark plug is an important engine component,
which should be checked periodically.
1. Remove the screws, and then pull outward on the
areas of front cover shown.
1 Screws
2 Front cover
Standard spark plug:
BPR4ES (NGK)
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
1
2
788-7CKa
7CK-28199-12_b 11.3.21 13:47 Page 29