Yamaha 8A Owner's Manual download pdf (Page 54)

Maintenance

49

2. Remove the spark plug. If electrode ero-

sion becomes excessive, or if carbon

and other deposits are excessive, you

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.

[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.

T

IP:

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.

EMU28990

Checking fuel filter

Check the fuel filter periodically. The fuel fil-

ter is a one piece, disposable type. If foreign

matter is found in the filter, replace it. For re-

placement of the fuel filter, consult your

Yamaha dealer.

EMU29043

Inspecting idling 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

Standard spark plug:

B7HS-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)

ZMU02874

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