Gasoline; Engine Oil; Propeller Selection - Yamaha 9.9D Owner's Manual

Take care not to spill gasoline. If gaso-
G
line spills, wipe it up immediately with
dry rags.
Do not overfill the fuel tank.
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Tighten the filler cap securely after refu-
G
eling.
If you should swallow some gasoline, in-
G
hale a lot of gasoline vapor, or get gaso-
line in your eyes, get immediate medical
attention.
If any gasoline spills onto your skin, im-
G
mediately wash with soap and water.
Change clothing if gasoline spills on it.
Touch the fuel nozzle to the filler open-
G
ing or funnel to help prevent electrostat-
ic sparks.
ECM00010
CAUTION:
Use only new clean gasoline which has
been stored in clean containers and is not
contaminated with water or foreign matter.
EMU25570

Gasoline

If knocking or pinging occurs, use a different
brand of gasoline or premium unleaded fuel.
Recommended gasoline:
Regular unleaded gasoline with a
minimum octane rating of 86 (Pump
Octane Number) = (R+M)/2
Gasohol
There are two types of gasohol: gasohol con-
taining ethanol and that containing methanol.
Gasohol containing ethanol can be used if
ethanol content does not exceed 10% and the
fuel meets minimum octane ratings. Yamaha
does not recommended gasohol containing
methanol because it can cause fuel system
damage or engine performance problems.
General information
EMU25650

Engine oil

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.
EMU25741

Propeller selection

The performance of your outboard motor will
be critically affected by your choice of propel-
ler, as an incorrect choice could adversely af-
fect performance and could also seriously
damage the motor. Engine speed depends on
the propeller size and boat load. If engine
speed is too high or too low for good engine
performance, this will have an adverse effect
on the engine.
Yamaha outboard motors are fitted with pro-
pellers chosen to perform well over a range of
applications, but there may be uses where a
propeller with a different pitch would be more
appropriate. For a greater operating load, a
smaller-pitch propeller is more suitable as it
enables the correct engine speed to be main-
tained. Conversely, a larger-pitch propeller is
more suitable for a smaller operating load.
Yamaha dealers stock a range of propellers,
and can advise you and install a propeller on
your outboard that is best suited to your appli-
cation.
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