Cleaning And Adjusting Spark Plug - Yamaha F350A Owner's Manual

EMU35061

Cleaning and adjusting spark plug

EWM00560
WARNING
When removing or installing a spark plug,
be careful not to damage the insulator. A
damaged insulator could allow external
sparks, which could lead to explosion or
fire.
ECM01511
CAUTION:
Use any tools to remove or install the
G
ignition coil, otherwise the ignition coil
coupler may get damaged.
Be sure to use the specified spark plug,
G
otherwise the engine may not operate
properly.
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 inspect the spark
plug because heat and deposits will cause
the spark plug to slowly break down and
erode.
1. Remove the flywheel cover from the rear
side.
2. Remove the bolts to remove the rear
cover.
3. Remove the bolts to remove the covers
of both port and starboard sides.
4. Remove the bolts to move the plate.
Maintenance
ZMU05899
ZMU05900
ZMU05901
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