Yamaha F4A Owner's Manual page 38

Maintenance
Tighten the air vent screw, if equipped.
3. Remove the engine top cowling and si-
lencer cover.
4. Install the outboard motor on the test
tank.
1. Lowest water level
2. Water surface
5. Fill the tank with fresh water to above the
level of the anti-cavitation plate.
ECM00290
CAUTION:
If the fresh water level is below the level
of the anti-cavitation plate, or if the water
supply is insufficient, engine seizure may
occur.
6. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging/lubricating of the engine is
mandatory to prevent excessive engine
damage due to rust. Perform the flush-
ing and fogging at the same time.
EWM00090
WARNING
Do not touch or remove electrical parts
G
when starting or during operation.
Keep hands, hair, and clothes away
G
from the flywheel and other rotating
parts while the engine is running.
33
7. Run the engine at a fast idle for a few
minutes in neutral position.
8. Just prior to turning off the engine, quick-
ly spray "Fogging Oil" alternately into
each carburetor or the fogging hole of
the silencer cover, if equipped. When
properly done, the engine will smoke ex-
cessively and almost stall.
2
1
ZMU02704
9. If "Fogging Oil" is not available, run the
engine at a fast idle until the fuel system
empties and the engine stops.
10. Remove the outboard motor from the
test tank.
11. Install the silencer cover or fogging hole
cap, and the top cowling.
12. Drain the cooling water completely out
of the motor. Clean the body thoroughly.
13. If "Fogging Oil" is not available, remove
the spark plug(s). Pour a teaspoonful of
clean engine oil into each cylinder.
Crank several times manually. Replace
the spark plug(s).
14. Drain the fuel from both the built-in and
portable fuel tanks, on equipped mod-
els.
NOTE:
Portable fuel tank equipped models: Store
the portable fuel tank in a dry, well-ventilated
place, not in direct sunlight.
ZMU02705