Procedure - Yamaha F4 Owner's Manual

Maintenance
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 recommended.
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

EMU45081
Flushing in a test tank
ECM00302
NOTICE
Before starting the engine, make sure to
supply water to the cooling water passag-
es. Otherwise, the engine could overheat
and be damaged.
Cooling system flushing is essential to pre-
vent the cooling system from clogging up
with salt, sand, or dirt. In addition, fogging of
the engine is mandatory to prevent excessive
engine damage due to rust. Perform the
flushing and fogging at the same time.
1. Wash the outboard motor body using
fresh water. NOTICE: Do not spray wa-
ter into the air intake.
information, see page 58.
56
For further
[ECM01841]
2. Fill the built-in fuel tank with fresh fuel
and add one ounce of "Yamalube Fuel
Stabilizer & Conditioner Plus" to each
gallon of fuel.
TIP:
The use of "Yamalube Fuel Stabilizer & Con-
ditioner Plus" eliminates the need to drain the
fuel system. Consult a Yamaha dealer or oth-
er qualified mechanic if the fuel system is to
be drained instead.
3. When using a portable fuel tank, discon-
nect the fuel hose, install the fuel joint
cap, and then align the fuel cock with the
closed position.
6EE-F4591-00
1. Closed position
4. Remove the top cowling and fogging
hole cap.
1
1. Cap
5. Remove the propeller. For further infor-
mation, see page 68.
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1
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