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  1. #1
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    2004 Merc Optimax 225

    What spark plug goes in the 2004 225 optimax I believe the NGK # is IZFR5G I just want to make sure Because they come out with bullitens all the time and want to order the right ones
    TJ

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #2

    Re: 2004 Merc Optimax 225 (Tjflickshake)

    As long as it's a STANDARD 225 Optimax: NGK: IZFR5G (.032-.033" gap)



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