Maintenance
76
the attitude shown when transporting
and storing it. If storing or transporting
the outboard motor on its side (not up-
right), put it on a cushion after draining
the engine oil.
Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble.
Store the outboard motor in a dry, well-
ventilated place, not in direct sunlight.
EMU41382
Conditioning and stabilizing gasoline
When preparing to store a boat for extended
periods (2 months or longer) it is best to com-
pletely remove all gasoline from the boat’s
fuel tank(s). If it is not possible to remove the
gasoline, add one ounce of “Yamalube Fuel
Stabilizer & Conditioner Plus” to each gallon
of gasoline in a full tank of gasoline to pro-
vide fuel stability and corrosion protection.
TIP:
Do not fill the fuel tank(s) to the point of over-
flowing. Approximately 7/8 full will allow
enough space in the fuel tank to prevent gas-
oline purging from the fuel tank vent due to
expansion with temperature changes.
Do not cap the fuel tank vent. Excessive
pressure could damage the boat and motor’s
fuel systems.
A partially filled fuel tank, less than 7/8 full
but not completely empty, is not recommend-
ed. Air space above the gasoline allows air
movement which can bring in water through
condensation as the air temperature chang-
es.
Condensation inside the fuel tank can cause
corrosion problems and phase separation of
gasoline containing ethanol.
Consult your Yamaha dealer concerning pre-
ventative measures that may work best for
the gasoline and environmental conditions in
your area.
EMU28306
Procedure
EMU28378
Flushing in a test tank
NOTICE
ECM00302
Before starting the engine, make sure to
supply water to the cooling water passag-
es. Otherwise, the engine could overheat
and be damaged.
1. Wash the outboard motor body using
fresh water.
NOTICE:
Do not spray wa-
ter into the air intake.
[ECM01841]
For fur-
ther information, see page 79.
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” to each gallon of fuel.
TIP:
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is
to be drained instead.
3. Remove the engine top cowling and si-
lencer cover.
4. Install the outboard motor on the test
tank.
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