Inspecting Idle Speed; Changing Engine Oil - Yamaha F50F Owner's Manual

properly. Before fitting the spark plug,
measure the electrode gap with a wire
thickness gauge; replace it if out of spec-
ification.
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)
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
Spark plug torque:
F50FEHT 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F50FET 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F60CEHT 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F60CET 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F70AET 17.0 Nm
(1.73 kgf-m, 12.5 ft-lb)
FT60DET 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
TIP:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past fin-
ger-tight. Have the spark plug adjusted to the
correct torque as soon as possible with a
torque-wrench.
EMU29044

Inspecting idle speed

EWM00451
WARNING
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.
ECM00490
NOTICE
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 10. If you have difficulty verifying
the idle speed, or the idle speed requires
adjustment, consult a Yamaha dealer or
other qualified mechanic.
EMU37494

Changing engine oil

ECM01710
NOTICE
Change the engine oil after the first 20
hours of operation or 3 months, and ev-
Maintenance
83