Yamaha F15 User Manual

Maintenance
78
F20EA, F20PA
EMU44850
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!
ZMU05595
6AG-9-3D-1E0.book 78 ページ ２０１５年１１月５日 木曜日 午前１１時７分

Yamaha F15 Specifications

General

Prop Shaft Horsepower	15 hp at 5500 rpm
Full Throttle RPM Range	5000 - 6000 rpm
Fuel Induction System	Carburetor
Lubrication System	Wet Sump
Gear Ratio	2.08:1
Starting System	Electric
Recommended Fuel	Regular Unleaded Gasoline (minimum pump octane number 87)
Steering	Tiller
Dry Weight	45 kg (99 lbs)
Shaft Length	15"