Spark Plug Inspection And Replacement - Mercury 75 OptiMax Owner's Manual

4. Secure the propeller nut by bending three of the tabs into
the thrust hub grooves.

Spark Plug Inspection and Replacement

Damaged spark plug boots may emit sparks which can ignite
fuel vapors under the engine cowl, resulting in serious injury or
death from a fire or explosion. To avoid damaging the spark
plug boots, do not use any sharp object or metal tool to remove
the spark plug boots.
1. Remove the spark plug leads. Twist the rubber boots slightly
and pull off.
2. Remove the spark plugs to inspect. Replace spark plug if
electrode is worn or the insulator is rough, cracked, broken,
blistered, or fouled.
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