Operation
23
throttle to 3000 r/min or less.
3.
Second hour:
Accelerate at full throttle onto plane,
then reduce engine speed to three-quar-
ter throttle (approximately 4000 r/min).
Vary engine speed occasionally. Run at
full throttle for one minute, then allow
about 10 minutes of operation at three-
quarter throttle or less to let the engine
cool.
4.
Third through tenth hours:
Avoid operating at full throttle for more
than 5 minutes at a time. Let the engine
cool between full-throttle runs. Vary en-
gine speed occasionally.
5.
After the first 10 hours:
Operate the engine normally. Use only
straight gasoline in the fuel tank. The
Yamaha oil injection system provides
proper lubrication for normal operation.
EMU27101
Preoperation checks
WARNING
EWM00080
If any item in the preoperation check is
not working properly, have it inspected
and repaired before operating the out-
board motor. Otherwise an accident
could occur.
CAUTION:
ECM00120
Do not start the engine out of water. Over-
heating and serious engine damage can
occur.
EMU27110
Fuel
●
Check to be sure you have plenty of fuel
for your trip.
●
Make sure there are no fuel leaks or gaso-
line fumes.
●
Check fuel line connections to be sure they
are tight (if equipped Yamaha fuel tank or
boat tank).
●
Be sure the fuel tank is positioned on a se-
cure, flat surface, and that the fuel line is
not twisted or flattened, or likely to contact
sharp objects (if equipped Yamaha fuel
tank or boat tank).
EMU27120
Oil
●
Check to be sure you have plenty of oil for
your trip.
EMU27130
Controls
●
Check throttle, shift, and steering for prop-
er operation before starting the engine.
●
The controls should work smoothly, with-
out binding or unusual free play.
●
Look for loose or damaged connections.
●
Check operation of the starter and stop
switches when the outboard motor is in the
water.
EMU27140
Engine
●
Check the engine and engine mounting.
●
Look for loose or damaged fasteners.
●
Check the propeller for damage.
EMU27170
Operation after a long period of
storage
When operating the engine after a long peri-
od (12 months) of storage, proceed as fol-
lows:
1.
Use a 50:1 gasoline-oil mixture to start
the engine.
2.
Start the engine. Leave it idling.
WARNING
EWM00090
●
Do not touch or remove electrical parts
when starting or during operation.
●
Keep hands, hair, and clothes away
from the flywheel and other rotating
parts while the engine is running.
Summary of Contents for 90D
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