Checking Fuel Filter; Inspecting Idling Speed - Yamaha 40V Owner's Manual

should replace the spark plug with an-
other of the correct type. WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
allow external sparks, which could
lead to explosion or fire.
Standard spark plug:
40VETO B7HS-10
40VWHTO B7HS-10
50HETO BR8HS-10
50HMHO BR8HS-10
50HWHTO BR8HS-10
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; adjust the gap to spec-
ification if necessary. When fitting the
plug, always clean the gasket surface
and use a new gasket.
1. Spark plug gap
2. Spark plug I.D. mark (NGK)
3. Spark plug part number
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
TIP:
If a torque-wrench is not available when you
[EWM00561]
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.
EMU29041

Inspecting idling speed

EWM00451
●
●
ECM00490
NOTICE
This procedure must be performed while
the outboard motor is in the water. A
Maintenance
the correct torque.
Spark plug torque:
25.0 Nm (2.55 kgf-m, 18.4 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.
ZMU06150
73