Yamaha 8B Owner's Manual download pdf (Page 67)

4-12

EMU01202

CLEANING AND ADJUSTING SPARK

PLUG

w

When removing or installing a spark plug,

be careful not to damage the insulator. A

damaged insulator could allow external

sparks, which could lead to explosion or

fire.

The spark plug is an important engine

component and is easy to inspect. The

condition of the spark plug can indicate

something about the condition of the

engine. For example, if the center elec-

trode 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

remove and inspect the spark plug

because heat and deposits will cause the

spark plug to slowly break down and

erode. If electrode erosion becomes

excessive, or if carbon and other deposits

are excessive, you should replace the

spark plug with another of the correct

type.

Before fitting the spark plug, measure the

electrode gap with a wire thickness

gauge; adjust the gap to specification if

necessary.

E

Standard spark plug:

Refer to “SPECIFICATIONS”, page 4-1.

Spark plug gap:

Refer to “SPECIFICATIONS”, page 4-1.

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