Maintenance
77
(3) Be sure to use the specified spark plug,
otherwise the engine may not operate
properly. Before fitting the spark plug,
measure the electrode gap with a wire
thickness gauge; replace it if out of spec-
ification.
(4) When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct 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.
EMU29045
Inspecting idle speed
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.
ECM00491
This procedure must be performed while
the outboard motor is in the water. A
flushing 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 smooth-
ly.
(2) Once the engine has warmed up, verify
whether the idle speed is set to specifi-
cation. For idle speed specifications, see
page 12. If you have difficulty verifying
the idle speed, or the idle speed requires
adjustment, consult a Yamaha dealer or
other qualified mechanic.
EMU38808
Changing engine oil
EWM00761
Avoid draining the engine oil immedi-
ately after stopping the engine. The oil
is hot and should be handled with care
to avoid burns.
Be sure the outboard motor is securely
Standard spark plug:
DPR6EB-9 (F40HET, F50HED,
F50HET, F60FET, FT50JET,
FT60GET)
LKR7E (F40GET, F70AET)
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Spark plug torque:
17 N·m (1.7 kgf·m, 13 lb·ft)
1
2
3
6C1-9-7J-1E0.book 77 ページ ２０１９年１０月３０日 水曜日 午後２時５６分
