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  1. #1
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    Default New Tech Spark Plugs

    Do you feel there would be any benefit to stepping up to a platinum or iridium spark plug or should a person just stick to the tried and true OE

  2. #2
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    Default Re: New Tech Spark Plugs

    Go with what the manual calls for and make sure it is a marine grade plug.

  3. #3
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    Default Re: New Tech Spark Plugs

    Quote Originally Posted by mrmushroomman View Post
    Go with what the manual calls for and make sure it is a marine grade plug.
    Sounds safe. What fun is in that?

  4. #4
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    Default Re: New Tech Spark Plugs

    Better to be safe than sorry, but you can try whatever plugs you want. There have been posts in the past about the different spark plugs used and preffered by others. Look back and try to find those posts and they might help you if you want to try something different.

  5. #5
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    Default Re: New Tech Spark Plugs

    It would be helpful to tell us what engine you are talking about. As a general rule it takes more voltage to fire a platinum or iridium spark plug versus a copper electrode spark plug. Platinum and iridium are used to reduce maintenance costs by having a spark plug that will last 100,000 miles. In fact, an old outboard engine that uses points will run better with an old-fashioned standard spark plug because it takes less voltage to fire the spark plug.

  6. #6
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    Default Re: New Tech Spark Plugs

    Quote Originally Posted by BruceAML View Post
    It would be helpful to tell us what engine you are talking about. As a general rule it takes more voltage to fire a platinum or iridium spark plug versus a copper electrode spark plug. Platinum and iridium are used to reduce maintenance costs by having a spark plug that will last 100,000 miles. In fact, an old outboard engine that uses points will run better with an old-fashioned standard spark plug because it takes less voltage to fire the spark plug.
    I've got a 2003 75hp 4 stroke (F75TLRB)

  7. #7
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    Default Re: New Tech Spark Plugs

    You should be using NGK LFR5A-11 spark plugs. Another point of caution is that so called equivalent spark plugs made by other manufacturers are not always equivalent. The heat ranges can and do vary. You could never put the amount of hours on your motor that a platinum or iridium plug is designed for. As a general rule of thumb, you should change spark plugs at a minimum, every season. It is also important to set the gap correctly and torque the spark plugs into the cylinder head. If you look at your owner's manual you can verify this. "Reading" a spark plug provides a wealth of information as to engine condition.

  8. #8
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    Default Re: New Tech Spark Plugs

    An equivalent Iridium plug is NGK LFR5AIX-11.
    After doing a little research,

    Pro's
    Better durability
    Superior anti-corrosion, anti-seizing properties
    More consistent spark
    Better acceleration
    Better fuel efficiency
    Longer life
    Improved cold starts

    Con's
    $1.50 more expensive

    I'm going to give them a try.

  9. #9
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    Default Re: New Tech Spark Plugs

    Better acceleration AND better fuel efficiency! You need to let the engineers at Yamaha know about these plugs.

  10. #10
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    Default Re: New Tech Spark Plugs

    I know it's just some sales pitch BS.
    But I will say these "engineers" are designing a mass produced product made to satisfy many. What one guy may like the next guy may not.
    There are allot of little things one could do to make it perform more to your specific needs/wants.

  11. #11
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    Default Re: New Tech Spark Plugs

    The standard NGK spark plug for your application is a surface discharge model. They are used so that the spark plug will not foul in slow speed (trolling) applications and will also run well in high speed applications. I noticed that NGK also lists the iridium spark plug for your motor. You might want to contact them and ask them if the iridium is better suited for your engine. Here is the NGK telephone number. 1-877-473-6767.

  12. #12
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    Default Re: New Tech Spark Plugs

    I aready had a little chat with NGK.

    FYI, A NGK LFR5A-11 is not a surface discharge plug.

  13. #13
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    Default Re: New Tech Spark Plugs

    If you go to the NGK web site:
    http://www.ngksparkplugs.com/part_fi...id=1923&type=v
    you will see that the standard spark plug for your motor, LFR5A-11, is a V-power spark plug. Click on the definition for V-Power and you will see that it is a surface discharge spark plug.

  14. #14
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    Default Re: New Tech Spark Plugs

    A surface discharge plug has no grounding electrode, The NGK LFR5A-11 is a standard plug with a grounding electrode.
    NGK is linking to the wrong picture.
    Stop by you local parts store and touch one for yourself.

  15. #15
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    Default Re: New Tech Spark Plugs

    You are absolutely correct that it is not a surface discharge spark plug. NGK posted the wrong information in their web site. Irridium sounds like a good choice. Are you going to torque the spark plugs?

  16. #16
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    Default Re: New Tech Spark Plugs

    Torqued to specs.

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