Yamaha F40F Owner's Manual download pdf (Page 88)

Maintenance

F30A, F40A

EMU28958

Cleaning and adjusting spark plug

The spark plug is an important engine com-

ponent and is easy to inspect. The condition

of the spark plug can indicate something

about the condition of the engine. For exam-

ple, if the center electrode porcelain is very

white, this could indicate an intake air leak or

carburetion problem in that cylinder. Do not

attempt to diagnose any problems yourself.

Instead, take the outboard motor to a

Yamaha dealer. You should periodically re-

move and inspect the spark plug because

heat and deposits will cause the spark plug

to slowly break down and erode.

1. Remove the spark plug caps from the

spark plugs.

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

ZMU06416

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Yamaha F40F Owner's Manual Page 88