Yamaha F40F Owner's Manual download pdf (Page 89)

Maintenance

83

allow external sparks, which could

lead to explosion or fire.

[EWM00561]

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.

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

whether the idle speed is set to specifi-

cation. For idle speed specifications, see

page 13. If you have difficulty verifying

the idle speed, or the idle speed requires

adjustment, consult a Yamaha dealer or

other qualified mechanic.

EMU38806

Changing engine oil

WARNING

EWM00760

 Avoid draining the engine oil immedi-

ately after stopping the engine. The oil

is hot and should be handled with care

to avoid burns.

 Be sure the outboard motor is securely

Standard spark plug:

DPR6EB-9

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)

Spark plug torque:

18 Nm (1.84 kgf-m, 13.3 ft-lb)

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