Maintenance
EMU28931
Greasing
Yamaha marine grease (Water resistant grease)
ZMU04266
EMU28951
Cleaning and adjusting spark plug
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 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 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 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:
Before fitting the spark plug, measure the electrode gap with a wire thickness gauge; adjust the gap to specification if necessary.
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