Maintenance
60
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 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.
EMU37450
Checking fuel filter
Check the fuel filter periodically. If any water
or foreign matter is found in the filter, clean or
replace it. For cleaning or replacement of the
fuel filter, consult your Yamaha dealer.
EMU29044
Inspecting idle speed
WARNING
EWM00451
●
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
ECM00490
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
Standard spark plug:
B8HS-10
BR8HS-10
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
Spark plug torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
ZMU06184
6H1-9-2A-1E0.book 60 ページ ２０１０年２月１７日 水曜日 午前１０時４２分
