Maintenance
72
To install the spark plug
1.
Wipe off any dirt from the threads, insu-
lator, and gasket surface of the spark
plug.
2.
Install the spark plug, and then tighten it
to the specified torque.
TIP:
If a torque-wrench is not available when you
are reinstalling a spark plug, a good estimate
of the correct torque is 1/12 turn past finger-
tight. When you are installing a new spark
plug, a good estimate of the correct torque is
1/2 turn past finger-tight.
3.
Install the spark plug cap.
4.
Fit the spark plug wire to the holder.
EMU29045
Inspecting idle speed
WARNING
EWM00452
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.
NOTICE
ECM00491
This procedure must be performed while
the outboard motor is in the water. A flush-
ing attachment or test tank can be used.
If the boat is not equipped with a tachometer
for the outboard motor, use a diagnostic ta-
chometer for this procedure. Results may
vary depending on whether testing is con-
ducted with the flushing attachment, in a test
tank, or with the outboard motor in the water.
1.
Start the engine and allow it to warm up
fully in neutral until it is running smoothly.
2.
Once the engine has warmed up, verify
whether the idle speed is set to specifi-
cation. For idle speed specifications, see
page 14. If you have difficulty verifying
the idle speed, or the idle speed requires
adjustment, consult a Yamaha dealer or
other qualified mechanic.
EMU38807
Changing engine oil
WARNING
EWM00761
Avoid draining the engine oil immediate-
ly after stopping the engine. The oil is
hot and should be handled with care to
avoid burns.
Be sure the outboard motor is securely
fastened to the transom or a stable
stand.
NOTICE
ECM01711
Change the engine oil after the first 20
hours of operation or 3 months, and every
100 hours or at 1-year intervals thereafter.
Otherwise the engine will wear quickly.
To prevent spilling oil where it could cause
damage to nature, it is strongly recommend-
ed that you use an oil changer to change the
engine oil. If an oil changer is not available,
drain the engine oil by removing the drain
screw. If you are not familiar with the proce-
dure for changing the engine oil, consult your
Yamaha dealer.
1.
Put the outboard motor in an upright po-
sition (not tilted).
NOTICE:
If the out-
board motor is not level, the oil level
indicated on the oil dipstick may not
be accurate.
[ECM01862]
Spark plug tightening torque:
25 N·m (2.55 kgf·m, 18.4 lb·ft)
U6HK30E0.book Page 72 Wednesday, December 13, 2017 5:32 PM
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2019 Yamaha Motor Corporation, U.S.A.
