Inspecting Idle Speed - Yamaha F40G Owner's Manual

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.
Spark plug torque:
F40DET 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F40GET 17.0 Nm
(1.73 kgf-m, 12.5 ft-lb)
F50FED 18.0 Nm
(1.84 kgf-m, 13.3 ft-lb)
F50FET 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)
FT50GET 18.0 Nm
(1.84 kgf-m, 13.3 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
Maintenance
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