Spark Plug Inspection - Yamaha MX825V-EFI Service Manual

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Spark plug inspection

The spark plugs are important engine components,
which should be checked periodically.
1.
Remove the spark plug caps and the spark plugs.
1. Spark plug cap
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2.
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.
3.
Check the spark plug type and gap.
1. Spark plug gap
Standard spark plug:
BPR6ES (NGK)
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.
4.
Install the spark plugs and then tighten them.
Spark plug tightening torque:
20 N·m (2.0 kgf·m, 14 lb·ft)
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.
5.
Install the spark plug caps.
Periodic maintenance
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