Thread: spark plugs

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  1. #1
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    spark plugs

    I have read somewhere that you should only use Champion plugs in a Johnson engine. NKG will cause misfire. Any truth to this? I need to replace plugs in my 2000 115 Johnson and am having trouble locating the right plug locally.
    Joefish
    2000 Javelin 115 Johnson
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  3. Member Danrude's Avatar
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    #2
    The champion plug is recommended, you need QL78YC Champion stock #938M. Your local auto parts store should be able to order them for you using the 938M #.
    Dan Burnette - Marietta, GA
    Triton TR20 - 200 HO E-TEC

  4. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #3
    Should not be that hard. If you have a NAPA, Oreilly's or Autozone you can have them order you Champion stock number 938M that is the QL78YC which is the plug for your motor.

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    #4
    Thanks guys. I was just trying to lay hands on them today (which did not happen). I went to NAPA , O'Reillys, and Auto zone. Guess I'll go back and order them and install when I can.
    Gap is .30 right?
    Joefish
    2000 Javelin 115 Johnson
    <*)}}}}><

  6. Moderator SEAHORSE's Avatar
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    #5
    Often you can find them at Walmart, West Marine, marinas, dealers, online, plus most auto supply houses can get them overnight
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  7. Member Coach_O's Avatar
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    #6
    I have a 2003 90hp Johnson and replaced mine with NKG's...is that not okay? I was planning on getting plugs on my way home today. If I need Champions does anyone know what specific Champion plugs I need? Any help would be great. Thank you
    '99 Nitro 640Lx
    '03 90hp Johnson


  8. Moderator SEAHORSE's Avatar
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    #7
    If you use NGK plugs in most J-E outboards, they must be the "Z" type plugs which cost several dollars apiece more than the factory installed Champion "Q" style plugs.

    The "R" series NGK are the wrong type and sometimes cause misfiring, fouling, and hard starting.

    The required plugs have an inductive component inside the shell, not a carbon resistor that lowers voltage and spark duration.
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  9. Member Coach_O's Avatar
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    #8
    Seahorse,
    I "was" using NGK 1098 BR7HS-10 plugs. Could this be a cause of underpowering if I used these plugs and not the "Z" type plugs? Toward the middle of the season it was taking my boat a little longer to get on plane and with two people it was tough going to get it up. Was thinking, since you mentioned I may be using the wrong plugs then my boat might have not been running at it's optimal power.
    Do you happen to know what specific plug numbers? For both NGK and Champion. I may stick with NGK's.
    '99 Nitro 640Lx
    '03 90hp Johnson


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    #9
    Champion QL78YC is the proper plug for your motor. Exclusively.

  11. Member Coach_O's Avatar
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    #10
    Thank you so much Duck. Could me using the wrong plugs be the cause of underpowering with my plane issue? I was thinking that after reading I had been using the incorrect plugs. Again thank you for the information and I will be picking them up on my way home today. Much appreciated.
    '99 Nitro 640Lx
    '03 90hp Johnson


  12. Member Coach_O's Avatar
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    #11
    After looking up the plug on the NGK site, I think that the plug for my motor is BZ7HS-10 Please let me know if that sounds right???
    '99 Nitro 640Lx
    '03 90hp Johnson


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    #12
    I personally would not put anything but a Champion plug in ANY 60 degree engine. These engines don't like plug variation and the symptoms they can exhibit are wide ranging. The Champion works perfect. I do not know what the correct NGK # would be, but in my mind, there isn't a correct NGK # (not an attempt at $martassness, just really the truth). Champ & Seahorse can carry this on farther than i ever could, but i could almost bet they are both gonna tell you to run the Champion QL plug. It's a perfect marriage.

  14. Member Danrude's Avatar
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    #13
    Use the Champions!
    Dan Burnette - Marietta, GA
    Triton TR20 - 200 HO E-TEC

  15. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #14
    Your boat and your choice. Keep in mind that when you come back wanting to know about replacing very expensive electrical components from running the wrong plugs be prepared for the I told you so's.

  16. Member Coach_O's Avatar
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    #15
    Lol. I just got home and am happy to say I am going with the Champions. I checked the books at West Marine and made sure that the QL78YC was the exact plug I needed to use and it sure was. I had the NGK's and asked about the Champions and I was lucky because the guy at West Marine said he didn't know for sure if they were going to continue selling those plugs...they had 12 of them and I bought 6, just in case two go bad during the season....I'm kind of a hoarder (don't tell my wife, she already knows). I am ready for the fishing season to begin. Thank you guys so much and of course BBC comes to the rescue once again. Thanks guys
    '99 Nitro 640Lx
    '03 90hp Johnson


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    #16
    why is it on boats, you cant run a cross referenced ngk supposedly, but on every other combustion engine known to man, you can?

  18. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #17
    That's how it rolls, been Champion since about day one so we don't stray. Been doing this stuff for a long time. No one questions Don Weed when he talks Mercs. We talk OMC/BRP.

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    #18
    No question from me........I appreciate you sharing your knowledge and experience to help me keep my Johnson engine running good.
    Joefish
    2000 Javelin 115 Johnson
    <*)}}}}><

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    #19
    And that's why Honda recommends NGK in there products and not Champion.
    They just work best that way!

  21. Moderator SEAHORSE's Avatar
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    #20
    Here is some information from Champion about the Q type plugs and inductive style needed for certain CD ignition


    Inductive Resistor
    Most automotive and power sport applications require the use of a resistor type spark plug to reduce RFI and properly communicate with electronic systems. However, CDI (capacitive discharge ignition) systems have a much lower voltage output. So while a resistor of some sort is still required, a standard resistor plug would be overkill, therefore, an inductive Resistor is used.

    In an Inductive Resistor design, a coiled nickel wire is inserted into the stem and held in place by a spring. The coil acts as an electromagnet, inducing a magnetic field around the center stem, creating a natural “field” resistor. This type of resistor creates around 40ohms of physical resistance, compared to the 1000-5000ohms of resistance in typical monolithic resistor plugs.

    A standard resistor plug, or non-Inductive Resistor type, should never be used in an engine that calls for an Inductive Resistor type. Use of a standard resistor plug can create an open circuit within the plug, ending its life.



    CDI
    CDI (Capacitive Discharge Ignition) for outboard marine motors is basically a refined version of the old magneto ignition system, except the points have been replaced with electronic circuitry. CDI is used on some late model marine engines, and some late model motorcycle engines. Do not use a standard resistor type plug on a motor with this type of Capacitive Discharge Ignition as it will cause misfiring and poor performance. Rather, be sure to use a plug with an inductive type resistor (such as the Champion Q-type).
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