Iridium Plug Gap

Discussion in 'Electrical' started by UncleRon, Jul 7, 2008.

  1. UncleRon

    UncleRon Member

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    I got some NGK Iridium spark plugs for the Heritage.
    There was a warning not to gap these plugs as it would
    break the tip. Had never heard of this and I'm uncomfortable
    not checking the gap . Has anyone had experience with
    this . The plugs were ordered specifically for the '04 Heritage
    but how can you be sure of the 0.040 gap other than sticking
    it in and seeing if/how long it works.
    Thanks .
    Unk
     
  2. wildspirit97

    wildspirit97 Senior Member

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    I have those in my wifes car.....runs fine. I'd just put them in and try it. I doubt you'll see a big difference from the H-D Plugs though.
     
  3. glider

    glider Veteran Member

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    Let us know what code your bike sets:s
     
  4. wildspirit97

    wildspirit97 Senior Member

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    good point! just putting different plug wires on mine set a code.:bigsmiley17:
     
  5. UncleRon

    UncleRon Member

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    Man, do I feel stupid :(
    I assumed the iridium plugs would not
    change the performance but thought
    they would perhaps maintain the same
    performance longer.
    I'm not even sure I know what you mean
    by "code" . Are you talking about having to
    re map if I use these plugs ?!? I am reading
    as much as I can but the learning process is
    slower for these old brain cells. I'll continue
    to give it my best shot somewhere .
    Unk
     
  6. Joyflyin

    Joyflyin Experienced Member Staff Member Moderator

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    Hey Unk, I think they are referring to setting a code for the bike, the diagnostic codes that make the engine light come on. I could be wrong, just a guess, I'm sure Glider or some one WAY more qualified can verify that for us. :57:
     
  7. Apyle

    Apyle Junior Member

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    As a parts man, most the precious metal plugs such as platinums and iridiums say to gap them to factory specs. It just takes a special type gaper. It takes one of the gappers that comes with the round type feeler gauges.
     
    Last edited: Jul 7, 2008
  8. Apyle

    Apyle Junior Member

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    Here's a picture of one it is a napa service tool part no. 164
     

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  9. glider

    glider Veteran Member

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    Joy hit it on the head here.:s

    But stay with the stock plugs so the knock sensor (ION sensing) still works.
     
  10. UncleRon

    UncleRon Member

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    Stock plugs it is . I tried to research the plug question
    and the only negative I found in the "archives here
    was the cost. It's not the first time I've wasted $20.00
    and , I'm sure it won't be the last :small3d015:
    Unk