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  1. 01-13-2020, 08:52 PM #1
    warhogz24
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    250 pro xs 4 stroke spark plug question

    Serial #2B574631
    Why do my plugs look burnt around the ceramic? I don't remember ever seeing any plugs I've replaced in the past look like this. Do I need to replace them or can I keep running them? What would cause this? Engine runs fine and has 120 hours on it.
    Reason I pulled them was to fog cylinders for storage.
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  2. EuropeanAM
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    Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2 01-14-2020, 07:58 AM
    This is quite common- and normal for plugs that have been in service for 18 months. Heat and condensation both play a role in this discoloration.


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  3. jrbdad
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    #3 01-14-2020, 08:08 AM
    Plugs for cars/trucks as well as boats will do that. As stated above no worries.
    Semper Fi
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  4. warhogz24
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    #4 01-14-2020, 11:17 AM
    Good to know. Thanks guys!
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