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  1. #1
    Member
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    Dec 2009
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    Double oill during break in foul spark plug?

    Okay i have completed my break in and went back to single oil. ( Reman power head now have about 15 plus hours on it oils injection removed ) I noticed it idling rough saturday and it has never done that since i got the new power head. Also if a plug is fouled will it die when you put it in reverse ? ( Did that first thing and it was cold didn't do it agian all day after that ) I have some new plugs and will replace them this weekend.
    0G825276

    Keith

  2. Member
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    Jul 2004
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    Penn PA
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    #2
    Possible......No way to tell without pulling them and inspecting.



  3. Member
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    Dec 2009
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    #3
    Thanks Savage i intend to do that this weekend. :)

  4. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    Apr 2008
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    Greenville, SC (US)
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    #4
    Pretty likely if you were running double oil (25:1) for 15 hours. Even at 50:1, it a bit rich at idle/low-RPM's.

    New set of QL77CC plugs would be my "first plan".


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  5. Member
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    Dec 2009
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    Plano Texas
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    #5
    Thanks Don i have a set QL77CC ready to go . Thanks :)

    Quote Originally Posted by EuropeanAM View Post
    Pretty likely if you were running double oil (25:1) for 15 hours. Even at 50:1, it a bit rich at idle/low-RPM's.

    New set of QL77CC plugs would be my "first plan".