Maintenance

lead to explosion or fire. [EWM00561]

Standard spark plug:

B8HS-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.

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 the correct torque.

Spark plug torque:

25.0 Nm (2.55 kgf-m, 18.4 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 finger -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.

ZMU06184

EMU29041

Inspecting idling 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 used.

A diagnostic tachometer should be used for this procedure. Results may vary depending on whether testing is conducted 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.

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