Yamaha F30 User Manual

Maintenance
86
F30A, F40A
EMU44851
Cleaning and adjusting spark plug
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, 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 outboard motor to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode.
1. Remove the spark plug caps from the
spark plugs.
2. Remove the spark plug. If electrode ero-
sion becomes excessive, or if carbon
and other deposits are excessive, you
should replace the spark plug with an-
other of the correct type. WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
ZMU06416
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Yamaha F30 Specifications

General

Engine Type	4-Stroke, SOHC
Prop Shaft Horsepower	30 hp
Full Throttle RPM Range	5000-6000 rpm
Starting System	Electric
Gear Ratio	2.08:1
Lubrication	Wet sump
Gear Shift	F-N-R
Displacement	747 cc
Fuel Induction System	EFI (Electronic Fuel Injection)
Ignition System	TCI
Shaft Length	15 in, 20 in
Steering	Remote
Bore x Stroke	65.0 mm x 75.0 mm (2.6 x 3.0 in.)