Greasing; Cleaning And Adjusting Spark Plug - Yamaha F2.5D Owner's Manual

Outboard motor f2.5d

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EMU28931

Greasing

Yamaha marine grease (Water resistant grease)

EMU28950

EWM00560

WARNING

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 compo-

nent 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 electrode porcelain is very white, this

could indicate an intake air leak or carburetion

problem in that cylinder. Do not attempt to di-

agnose 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 ex-

cessive, or if carbon and other deposits are

excessive, you should replace the spark plug

with another of the correct type.

Standard spark plug:

BR6HS

Maintenance

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F2.5mhd