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  1. #1
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    Don, Merc pro xs spark plug gap?

    My 2008 250 pro xs owners manual calls for a .032 spark plug gap but I noticed that Don recommends a. 042-.044 gap, should I use the .042 gap in lieu of the .032?

  2. Member
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    #2
    Spark Plugs:
    -QL77CC (Champion) for 3 Liter EFI's (.035" 2001 and prior and ALL 250XB, .040" 2002->)
    -IZFR5G@ .032-.033" for Standard Opti's 135-225HP and 200 ProXS PRIOR TO Serial Number#1B912786
    -IZFR5J @.032-.033 for 75-115 Opti's
    -IZFR6J for 150, 175, 200 ProXS (Serial #1B912786-up) & 225-250 ProXS and Racing XS Motors
    -2005 & prior: .032-.033"
    -2006 & up: .042-.044" gap for best idle performance. (150/175/225/250 ProXS/XS)
    - 250 XS/ProXS can use IZFR6J (gapped to .042-.044") OR IZFR6J-11 (pre-gapped, currently a "factory only" plug)
    -2006 & up 225 ProXS: .042-.044"
    -175 ProXS: .042-.044"
    *** 200 ProXS Models manufactured PRIOR TO 2/1/12 utilize IZFR5G Plugs.
    *** 200 ProXS Models manufactured AFTER 2/1/12 (Serial Number 1B912786 and later) will utilize IZFR6J (gapped at .042-.044") due to production changes in the engines.


    -IZFR7M for 300XS: .044" Gap

    You looked at the right year, right?
    Last edited by BILLY; 06-11-2012 at 06:51 PM.
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  3. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #3
    Quote Originally Posted by Superpro View Post
    My 2008 250 pro xs owners manual calls for a .032 spark plug gap but I noticed that Don recommends a. 042-.044 gap, should I use the .042 gap in lieu of the .032?
    Gap them at .044".


    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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