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  1. #1
    Member 241's Avatar
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    Spark plugs for 250 Pro XS 4 stroke?

    I've tried to order plugs and can't find anyone who has the NGKs. Any use other plugs or know someone that I can order from?
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  2. Member 06 SB's Avatar
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    #2
    Don Weed maybe. Why change the plugs already?

    USN Retired
    2020 Basscat Caracal
    2020 Mercury 225 ProXS 4s



  3. Member 241's Avatar
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    #3
    Running rough. Changed them at 50hrs for the same thing. Now I'm at 80hrs. I sure hope this is what it is.
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  4. mikesxpress
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    Rock Auto

  5. Member 06 SB's Avatar
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    #5
    Quote Originally Posted by 241 View Post
    Running rough. Changed them at 50hrs for the same thing. Now I'm at 80hrs. I sure hope this is what it is.
    Wow, I am at 96 hours and 18 months on my current plugs without any issue. What gas are you using?

    USN Retired
    2020 Basscat Caracal
    2020 Mercury 225 ProXS 4s



  6. Member 241's Avatar
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    #6
    Regular name brand fuel. Add quickleen every fill up. My motor is a 2018.
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  7. Member 241's Avatar
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    #7
    Can’t find on their site. Part number I have for NGK 93961. Is this the wrong plug? Dealer replaced them last so I'm not sure if they are correct.
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  8. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #8
    -Please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks!

    -Do not use "alternate" spark plugs in your engine.

    -OEM Mercury/Quicksilver, OR genuine NGK's. Did you contact Rhonda (see her post at the top of the Forum)?


    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

  9. Member 241's Avatar
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    #9
    I'll look for her post.

    Serial 2B590153
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  10. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #10
    Mercury Part# 8M0135348

    NGK: LKAR7C-9


    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

  11. Member
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    #11
    NGK's item # for the LKAR7C-9 is NGK93961 they are one and the same.
    _______

    Phil
    '09 Hewescraft ProV
    '09 150 Optimax


  12. Scraps
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    #12
    Quote Originally Posted by 06 SB View Post
    Wow, I am at 96 hours and 18 months on my current plugs without any issue. What gas are you using?
    Aren't plugs required to be replaced annually? I have a 2S but assume same for 4S??
    2017 Phoenix 819
    2016 200ProXS, s/n 2B359849, Mod 1200P73BD

  13. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #13
    Not mandatory but should be inspected at 1 year/ 100hr intervals (whichever occurs FIRST) and replaced if required.

    We're finding most 4-strokes used on Bass rigs are getting plugs annually, however (whether done as a proactive measure during service, or when it begins to run poorly after spending 50+% of it's runtime "below 1500 RPM's".


    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

  14. Member 241's Avatar
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    #14
    Quote Originally Posted by EuropeanAM View Post
    Mercury Part# 8M0135348

    NGK: LKAR7C-9

    Seems that nobody has them. I'll order some and they hope to arrive in July.
    2016 Z520, 2018 250 Pro LPXS sn/ 2B590153, Helix 10s on bow and console, 360 bow and 112 Ultrex, 126sv and Livescope.
    Son inherited - 1997 462VS 150 Johnson Faststrike, 800 series birds, side image, 110 Fortrex


  15. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #15
    Nobody? Hmmmm... did you happen to contact Rhonda (see her post, pinned at the top of the Forum)?


    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

  16. Scraps
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    #16
    Quote Originally Posted by EuropeanAM View Post
    Not mandatory but should be inspected at 1 year/ 100hr intervals (whichever occurs FIRST) and replaced if required.

    We're finding most 4-strokes used on Bass rigs are getting plugs annually, however (whether done as a proactive measure during service, or when it begins to run poorly after spending 50+% of it's runtime "below 1500 RPM's".
    Fishing techniques requiring a lot of idle time nowadays. I know my 2S plugs at a year look like they need to be changed. I don't see a degradation in performance, but quite a bit of carbon buildup on each plug. My fuel tends to get used very slowly, always treated, but probably not the best practice to let fuel sit for weeks.
    2017 Phoenix 819
    2016 200ProXS, s/n 2B359849, Mod 1200P73BD

  17. Member Bartman's Avatar
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    #17
    Quote Originally Posted by 241 View Post
    Seems that nobody has them. I'll order some and they hope to arrive in July.
    I just ordered a set off <EDIT- READ ANNOUNCEMENTS> and got them in 2 days. They shipped from Florida.
    Last edited by EuropeanAM; 05-26-2022 at 04:57 PM.

  18. Scraps
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    #18
    https://speedncustommarine.com/

    Have ordered from these guys at good prices. I've always bin leary of <EDIT- READ ANNOUNCEMENTS> plugs.
    Last edited by EuropeanAM; 05-26-2022 at 04:57 PM.
    2017 Phoenix 819
    2016 200ProXS, s/n 2B359849, Mod 1200P73BD

  19. Member
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    #19
    Don, 250 4S serial # 2B644821, spark plug (NGK & Marcury) for this serial number please. Thanks
    2019 Z21 Nitro
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  20. Member
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    #20
    Hello guys
    Is there a iridium spark plug to substitute those listed above for V8?

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