Mercury 250 Specifications download pdf (Page 74)

MAINTENANCE

10.Secure propeller nut by bending three of the tabs into the

thrust hub grooves.

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Spark Plug Inspection and Replacement

WARNING

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.

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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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Mercury 250 Specifications Page 74