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Spark plugs

Discussion in 'Technical' started by lee, Dec 23, 2008.

  1. oldmutt

    oldmutt Active Member

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    I have 11K on my mutt and I change plugs at 2500 miles along with the oil. The champs are $1.99 each at Auto Zone. If I can pay $11 a quart for amsoil I can afford new plugs.
     
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  2. HuskerChop

    HuskerChop Member

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    What the hell, I will throw my 2 cents in on this! I raced late models (VP Fuel) and sprintcars (Methanol) and Spanel Engines and Gaerte Engines built all of my motors. Racers are notorious for 'monkey see, monkey do' On both motors, latemodel 358 cast iron Bowtie heads and Sprint 360 aluminum heads, on the dyno, sequential pulls we compared champion vs NGK. I was surprised at results. Each spark plug change between the 2 had indexing and reach shimmed to be almost exact. On cast headed motor, champion plugs were 1.2 hp, 2.1 tq better, on aluminum headed sprint, the NGK's were the better by about same amount than Champion. Total of 4 pulls on each chg. Results were repeated. I run NGK DCPR7E in my Chopper, about $2 bucks and chg each season.
     
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  3. Vince81

    Vince81 Banned

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    I change the plugs in my bikes about once a month or maybe every 10 to 12 hours of riding on my street bikes - sometimes even more often than that.
    Spark Plugs are cheap and it's just a regular maintenance habit of mine to grab a new set every time I clean or go over that particular bike I'm riding that day .:D
    Grab em ,gap em , install em and grab a glance at the old ones before I chuck em in the garbage.
    Vince
     
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  4. stinger1

    stinger1 Member

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    I found my dog runs better on NGKs....
     
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  5. francoblay1

    francoblay1 The Spaniard

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    NGK DCPR7E @ $3.80 per pack of 10

    Pack of 10 NGK DCPR7E spark plugs for $3.80 !!!

    [ame=http://www.amazon.com/SPARK-PLUG-3932-Pack-10/dp/B0025QVT6G/ref=sr_1_7?ie=UTF8&qid=1343304686&sr=8-7&keywords=ngk+dcpr7e]Amazon.com: SPARK PLUG # 3932 , Pack of 10: Automotive[/ame]


    But.... why when checking if it fits BDM models in the page it says "IT DOES NOT FIT"?????? What you reckon guys? In the page it states they are DCPR7E s, so..... :confused:

    Also, what is the difference between DCPR7E and DCPR7ESFP

    Your inputs, please?

    :cheers:
     
    #25 francoblay1, Jul 26, 2012
    Last edited: Jul 26, 2012
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  6. francoblay1

    francoblay1 The Spaniard

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    I've waited for over three hours for some feedback and nothing....

    Decided to buy the NGK DCPR7EIX (Iridium) :D

    :cheers:
     
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  7. bigdog2003

    bigdog2003 Member

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    A 107 is basically an Evo. I use Champion RN12YC in mine and it runs great. $2.50 a piece at my local bike shop.
     
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  8. bigdog2003

    bigdog2003 Member

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    And ... don't forget the anti-seize paste.
     
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  9. BigDogBro1

    BigDogBro1 Made in the USA

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    My Bike(s):
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    We run Champion plugs with the smaller hex nut pattern using a 5/8" wrench. RA6HC?

    Much easier to install and remove.
     
    #29 BigDogBro1, Jun 28, 2013
    Last edited: Sep 3, 2014
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  10. Jgroth41

    Jgroth41 Member

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    So i pulled my plugs today and i have autolite AP65 plugs..does not cross referance with anything plus they are a 14mm thread..Im told i need a champion RA8HC, N12YC or a Auto lite 4164...all of these are 12mm threads..Did the previous owner screw up ?.. Will i be able to put the proper plugs in?.. Im very concerned
     
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  11. Th3InfamousI

    Supporting Member

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    Those are right for the 04 and older engines you are fine.

    The quoted 12YC are for 04 and earlier.

    Engines went from the S&S Super Sidewinder (SSW) to the S&S Super Sidewinder plus in 05 (SSW+). For some reason they went to a smaller plug along with a few other changes cam to crank sensor and new breathing

    Sent from my 831C using Tapatalk
     
    #31 Th3InfamousI, Feb 22, 2016
    Last edited: Feb 22, 2016
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  12. Jgroth41

    Jgroth41 Member

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  13. Jgroth41

    Jgroth41 Member

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    Are the 12YC 14mm ?... the champions i just bought (RA8HC are to small..they just drop in..
     
    #33 Jgroth41, Feb 22, 2016
    Last edited: Feb 23, 2016
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  14. Jgroth41

    Jgroth41 Member

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    I found it..thanks
     
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  15. john sachs

    john sachs Active Member

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    If your bike is jetted & timed right, you can run 20,000 + miles on a set of plugs, no problem.
    Check them occasionally for build up of residue. If there's any, you need to change them. If the electrode is burnt, and really rounded, same deal.
    John
     
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  16. Jgroth41

    Jgroth41 Member

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    Thanks Man, I just put in the new ones..it back fired when i first started it but ran good..I might have to tighten the plug gap a little..im at a loose 40
     
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  17. john sachs

    john sachs Active Member

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    I like .035", unless the compression is over 11.5:1. Then I'll go to .032".
    Be sure when replacing the plugs to make them tight. I can't count the # of bikes that come into my place with plugs that aren't as tight as they should be.
    I tighten the new plug with a drop of oil on the threads, back off, and re-tighten them tight.
    John
     
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  18. Jgroth41

    Jgroth41 Member

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    Thanks..I will try .035
     
  19. MossBerg590

    MossBerg590 Active Member

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    Do you torque them John? I always just tighten by feel but am skeptical to over tighten.
     
  20. Jgroth41

    Jgroth41 Member

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    Update..for shits and giggles i set the plugs at .038..Big difference than .040..more power ..Tomorrow i will try the 0.35 and see how that goes.
     
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