Maintenance
87
EMU46322
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 cover.
(2) F115, LF115: Remove the spark plug
cap from the spark plug.
(3) F130, LF130: Remove the bolt that is se-
curing the ignition coil, and then remove
the ignition coil. NOTICE: Do not use
any tools to remove or install the igni-
tion coil. Otherwise, the ignition coil
coupler could be damaged.
[ECM02331]
(4) Remove the spark plug. WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could al-
low external sparks, which could lead
to explosion or fire.
[EWM00562]
1. Cover
1. Spark plug cap
1. Bolt
2. Ignition coil
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