Inspecting Spark Plug - Yamaha F225F Owner's Manual

EMU40665

Inspecting spark plug

The spark plug is an important engine com-
ponent. The condition of the spark plug can
indicate something about the condition of the
engine. For example, if the center electrode
porcelain is very white, this could indicate an
intake air leak or carburetion problem in that
cylinder. Do not attempt to diagnose any
problems yourself. Instead, take the out-
board motor to a Yamaha dealer. You should
periodically remove and check the spark
plug because heat and deposits will cause
the spark plug to slowly break down and
erode.
To remove the spark plug
1. Remove the flywheel magnet cover after
removing the bolt.
1
1. Flywheel magnet cover
2. Bolt
2. Remove the ECM (Electronic Control
Module) cover.
1
1. ECM (Electronic Control Module) cover
3. Remove the bolt that is securing the ig-
nition coil, and then remove the ignition
coil. NOTICE: Do not use any tools to
remove or install the ignition coil.
Otherwise, the ignition coil coupler
could be damaged.
1
2
1
2
2
1
2
1. Bolt
2. Ignition coil
Remove the spark plug. WARNING!
4.
ZMU07182
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
allow external sparks, which could
lead to explosion or fire.
Maintenance
ZMU07183
[ECM02331]
1
2
1
2
1
2
ZMU06973
[EWM00562]
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