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2005 Optimax 225 spark plugs

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  • 2005 Optimax 225 spark plugs

    Can anyone tell me what are the proper NGK plugs to use for this engine? I have looked all over a bunch of forums and nobody yet has told me the part # for the plugs for this engine. Can anyone help please.

  • #2
    Re: 2005 Optimax 225 spark plugs

    In about one minute I went to the NGK site and got this number PZFR5F-11. NGK is a very good plug, maybe it'll help that Opti-Pop.

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    • #3
      Re: 2005 Optimax 225 spark plugs

      I saw that also. That is for the 1998-2002 model. Can that be used in a 2005 model?

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      • #4
        Re: 2005 Optimax 225 spark plugs

        With an engine SN, I could tell you what Mercs recommendation from the service manual is. without a SN, it would just be guessing.
        Don S.


        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

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        • #5
          Re: 2005 Optimax 225 spark plugs

          Don't know about the Opti's but on some engines there is a sticker on the engine block with the timing and spark plug information. The owners manual should also contain that information.

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          • #6
            Sign up today
            Re: 2005 Optimax 225 spark plugs

            Right out of my Mercury Book- for my 2005 225 Mercury Optimax is:

            NGK IZFR5G

            .8 mm or ( .031 in ) GAP



            DELRUS

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