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Iridium spark plugs (2008)

Discussion in 'Norton Commando Motorcycles (Classic)' started by COMMANDO1954, Sep 15, 2008.

  1. COMMANDO1954

    COMMANDO1954

    Joined:
    Aug 13, 2008
    Anyone changed to Iridium plugs? Did you notice any improvements?
     
  2. Coco

    Coco

    Joined:
    Aug 14, 2006
    I've thought about it but can'ty find any locally. Anyone have an NGK part number for a MKIII Commando?
     
  3. BrianK

    BrianK

    Joined:
    Jun 14, 2007
    I did, in a 73 850. They foul much less easily (I was running way too rich at the time, a problem since rectified).

    I have since converted all of my bikes to iridium fine-wire plugs.

    If you go to sparkplugs.com, they have a feature to identify the right plugs for your application.
     
  4. COMMANDO1954

    COMMANDO1954

    Joined:
    Aug 13, 2008
    Iridium plugs

    NGK BPR7EIX 4055 for all Commando's.
     
    chaztuna likes this.
  5. kommando

    kommando

    Joined:
    May 7, 2005
    I run them on all my bikes including a C15, no fouling issues and always the best chance of a spark if something else is past its best.
     
  6. mikegray660

    mikegray660

    Joined:
    Nov 5, 2006
    the spark plug debate, is much like synth vs. dino oil debate

    use what you like best and go with it

    that being said i use the platinum autolite ap-63's -

    their cheap and can be found any auto parts store

    since my bike starts in 1 kick 90% of the time , and doesn't foul plugs they work for me
     
  7. hursty

    hursty

    Joined:
    Nov 26, 2006
    Hello all,

    I just fitted some NGK Platinium BP7EVX to my Norvil Commando with great results.
    I had a blast to Brighton for the Rockers Reunion Ace Cafe Do this weekend & found the throttle response & pickup improved & first kick starting hot or cold.
    Had a look at the plug colour & its perfect both sides so I would recommend these plugs.
    Hursty :D
     
  8. Fritz

    Fritz

    Joined:
    Sep 10, 2008
    I'm currently running the standard NGK's (BP7ES). I see that the Iridium plugs are resistor types...if this is true, are there any negative issues using the Iridium plugs with an electronic (Sparx) ignition??
     
  9. hursty

    hursty

    Joined:
    Nov 26, 2006
    Fritz,

    The Platinium type I am using NGK BP7EVX has no (R) in the part number so I don't believe this is a resistor type plug.
    My bike is fitted with Boyer ignition so I can't see yours having a problem with the Platinium type plugs.
    Give it a go I am sure you will be pleased with the result :)
     
  10. mikegray660

    mikegray660

    Joined:
    Nov 5, 2006
  11. steveyacht

    steveyacht

    Joined:
    Aug 11, 2009
    I know that this is an old thread, but had to research the iridium vs copper plugs, since I had some plug fouling issues. I found this:

    Copper Spark Plugs
    Copper spark plugs are generally considered to have the best performance of any spark plug type. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Platinum and iridium plugs are more likely to overheat, which causes damage to the plug components and can compromise the delivery of the spark to the engine block.

    The entire article can be found at: https://www.carsdirect.com/car-repa...m-and-platinum-understand-for-top-performance
     
  12. Danno

    Danno

    Joined:
    Feb 7, 2010
    I love my antique Champion N4G plugs (no longer manufactured). Always were the best back in the day and haven't found anything better, including Iridiums.
     
  13. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    If you have plug fouling issues go for Champion... once NGK foul they are finished
     
  14. Deets55

    Deets55 VIP MEMBER

    Joined:
    Oct 3, 2013
    2DDCD854-17D0-434B-A44C-39CE7C090ED1.png My understanding is most quality plugs all have a copper core. The difference is the tip material.
     
  15. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    N3 N4 N5 N6Y N7Y I have used in various bikes but what is N4G
     
  16. Danno

    Danno

    Joined:
    Feb 7, 2010
    Gold Palladium wire electrode. As the wire slowly deteriorates. it forms a tiny gold mushroom on the tip. You can run 'em until the wire gets down to the insulator. Sadly no longer in production. Recently scored a stash of NOS.

    I've been told they give the advantage of a hotter plug without the risks.
     
  17. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    Not seen them in the UK used N4 as my plug of choice for ES2... In fact Champion are not easy to get hold of here . Shame because they will tolerate oily engines and over rich mixtures
     
  18. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Jeez, N4G....I had a handfull back in '78, given to me by the Champion rep at the Earls Court show where I had my race bike on display, yep they were good. That was where I first met Peter Williams.

    He gave them to me after I told him that I had been given a box of Autolite race plugs and they had a 50% failure rate.

    I also had some N64Ys, box full, used once for dyno runs in Cosworth DFVs at BRM in Bourne Lincs. The alternative to the N4Gs and N64Ys was the N57R, but there was a possiblility of fouling if used from cold.

    But, like this thread, this is history, today I run Denso IW27s.

    On a road bike NGK BP7ES is fine.
     
  19. Madnorton

    Madnorton

    Joined:
    Jun 9, 2008
    I run Iridiums, would not change back now. Beware there are a lot fakes out there, two branch members had been caught out. If you have both in your hands the fake is the considerably lighter plug. I swapped my plugs into a bike at a meet and it proved instantly it was the plugs and nothing else.
     
  20. scotnort75

    scotnort75

    Joined:
    May 26, 2016
    I was running the NGK iridium
    but switched to the Denso version and found them slightly better regarding throttle response on
    my 76 Mk3.
    Cheers.