Spark Plug Thread

Discussion in 'Airheads' started by some_guy, Jan 23, 2013.

  1. Rucksta

    Rucksta SS Blowhard

    Joined:
    Oct 26, 2008
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    2,724
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    Gold Coast
    Long life, multi tip or micro tip plugs run well in my Subaru or in the Kia V6.
    When I have to pay a mechanic big $ to change the plugs along with the timing belts at 100,000 K I don't mind paying $25.00 for a plug.

    For the Beemer where the plugs are hanging in the breeze simple (cheaper) is better.
    #21
  2. chollo9

    chollo9 Screwed the Pooch

    Joined:
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    1,628
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    Silk Hope, NC
    Exactly. I paid a lot for this mod--it sure did make a difference.

    Been down the race bike road--not on it anymore. Even though I may ride the hell out of my airhead, it's not a race bike and I feed it parts accordingly.

    Only my opinion, of course.
    #22
  3. Bill Harris

    Bill Harris Confirmed Curmudgeon

    Joined:
    Sep 20, 2008
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    9,738
    Location:
    backwoods Alabama
    Midwinter? Check.
    Major Winter storm bearing down? Check.
    Oil/Tire/Battery/Sparkplug Thread looming? (Check One)

    Sorry, I was compelled... :eek1

    --Bill
    #23
  4. Hookalatch

    Hookalatch Born Under Bad Sign

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    #24
  5. Stagehand

    Stagehand Imperfectionist

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    Shawangunks
    #25
  6. supershaft

    supershaft because I can

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    #26
  7. Stagehand

    Stagehand Imperfectionist

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    cool, thanks for the clue.
    #27
  8. Stagehand

    Stagehand Imperfectionist

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    octane, too, presumably
    #28
  9. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Octane? Not really, though a sparkplug with a heat rating way too hot can cause detonation even with high octane fuel.

    With NGK plugs, the higher the heat rating number the colder the plug. The lower the heat number, the hotter the plug. Bosch has the heat number run oppositely, as does Champion (I think. Maybe.). I have a chart of sparkplug equivalents on my reference shelf, so I don't need to commit it to memory.

    --Bill
    #29
  10. motu

    motu Loose Pre Unit

    Joined:
    Dec 28, 2001
    Oddometer:
    4,902
    Location:
    New Zealand
    That's why I used to use the Plus 4's in my shop - if they are a hard access plug, rather than charge the customer a fortune for plats, I'd put in the Plus 4's which cost only a couple of dollars more than a standard plug, and last almost as long as a plat. Had the Plus 4's in my Lada, took them out when I sold it....so the Airhead has plugs for 10 years.
    #30
  11. chasbmw

    chasbmw Long timer

    Joined:
    Feb 19, 2006
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    2,676
    Location:
    Bath Uk
    If your airhead is dual plugged, use a hotter running plug in the lower position, because the hotter running plug will help burn off the oil etc that tends to end up on the lower plug, so with NGKs I might use a '7' in the top and a '6' on the bottom.
    #31
  12. supershaft

    supershaft because I can

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    San Francisco Bay area

    I am running 6's top and bottom on my bike. I am curious to see how many miles it is going to take for that issue to show up. At 3000 miles top and bottom are burning identically.
    #32
  13. daveoneshot

    daveoneshot Been here awhile

    Joined:
    Dec 14, 2010
    Oddometer:
    465
    Location:
    Vermont
    I like to cover all the bases on my '78 R 100, so to add spice to the mix I carry Bosch, NGK, Champion, and Autolite plugs in the tank bag. The bike doesn't mind.
    #33