Start-In-Gear Protection; Engine Oil Requirements; Fuel Requirements; Gasoline - Yamaha 15F Owner's Manual

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1 2 3
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
EMU39192

Start-in-gear protection

Yamaha outboard motors are equipped with
start-in-gear protection device. This feature
permits the engine to be started only when it
is in neutral. Always select neutral before
starting the engine.
EMU25652

Engine oil requirements

Recommended engine oil:
YAMALUBE 2-stroke outboard motor
oil
If the recommended engine oil is not avail-
able, another 2-stroke engine oil with an
NMMA-certified TC-W3 rating may be used.
EMU36361

Fuel requirements

EMU40202

Gasoline

Use a good quality gasoline that meets the
minimum octane rating. If knocking or ping-
ing occurs, use a different brand of gasoline
or premium unleaded fuel.
Recommended fuel:
Regular unleaded gasoline
Min. research octane number (RON):
90
Specifications and requirements
ECM01982
NOTICE
 Do not use leaded gasoline. Leaded
 Avoid getting water and contaminants in
ZMU04606
Gasohol
There are two types of gasohol: gasohol con-
taining ethanol (E10) and that containing
methanol. Ethanol can be used if the ethanol
content does not exceed 10% and the fuel
meets the minimum octane ratings. E85 is a
fuel containing 85% ethanol and must not be
used in your outboard motor. All ethanol
blends containing more than 10% ethanol
can cause fuel system damage or cause en-
gine starting and running problems. Yamaha
does not recommend gasohol containing
methanol because it can cause fuel system
damage or engine performance problems.
It is recommended that you install a water-
separating marine fuel filter assembly (10 mi-
cron minimum) between your boat's fuel tank
and outboard motor when using ethanol. Eth-
anol is known to allow moisture to be ab-
sorbed into boat fuel tanks and systems.
Moisture in the fuel can cause corrosion of
metallic fuel system components, starting
and running complaints and require addition-
al fuel system maintenance.
EMU36331
A clean hull improves boat performance. The
boat bottom should be kept as clean of mari-
ne growth as possible. If necessary, the boat
gasoline can seriously damage the en-
gine.
the fuel tank. Contaminated fuel can
cause poor performance or engine dam-
age. Use only fresh gasoline that has
been stored in clean containers.

Anti-fouling paint

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