Inspecting Idle Speed - Yamaha F50 Owner's Manual

Maintenance
sulator. A damaged insulator could
allow external sparks, which could
lead to explosion or fire.
Standard spark plug:
F50B DPR6EB-9
F50HB DPR6EB-9
F60B DPR6EB-9
F60HB DPR6EB-9
F70A LKR7E
F70HA LKR7E
T50B DPR6EB-9
T60B DPR6EB-9
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.
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.
86
[EWM00561]
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

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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.
Spark plug torque:
F50B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F50HB 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F60B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F60HB 18 Nm (1.84 kgf-m, 13.3 ft-lb)
F70A 17 Nm (1.73 kgf-m, 12.5 ft-lb)
F70HA 17 Nm (1.73 kgf-m, 12.5 ft-lb)
T50B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
T60B 18 Nm (1.84 kgf-m, 13.3 ft-lb)
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.
Start the engine and allow it to warm up
fully in neutral until it is running smoothly.