Thread: Spark Plug Gap?

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  1. Member
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    Jul 2009
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    #21
    Don:

    Dumb question: Why are the "wire" type gages better than the "blade" type gages ? Since you typed it in full caps, I presume there is a significant difference in accuracy.

  2. Member
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    May 2011
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    Spangle, WA
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    #22
    Great risk of damaging the plug tip using traditional feeler gauge vs wire gauge.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  3. 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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    #23
    Quote Originally Posted by SilverFox579 View Post
    Great risk of damaging the plug tip using traditional feeler gauge vs wire gauge.
    +1


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  4. Member
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    Mar 2015
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    Dayton, Texas
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    #24
    Well I haven't been able to get it back on the water yet to test it under load, but it's now running great in the test tank. Was able to run it for about 15 minutes from 600 rpm up to 2500 and it ran smooth as glass. Before I changed the plugs idle was really rough and got worse at higher rpm. Hopefully the plug change was all it needed. Still disappointed that I'm having to replace plugs with less than a 100 hours.
    Data 1.JPG
    Data 2.JPG

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #25
    Perhaps- but you have to remember they've been in that engine for right at 39 months now.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

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