Spark Plug Recommendation

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Jun 24, 2011 | 12:51 PM

bunotz

Thread Starter

Cruiser

Joined: Jun 2008

Posts: 193

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From: Henderson, NV

Spark Plug Recommendation

I want to change the spark plugs on my 2008 Road King. I am looking for any recommendations on a spark plug beside what is listed in the owner’s manual? Thanks

Jun 24, 2011 | 01:03 PM

MrHog

Road Captain

Joined: Jun 2009

Posts: 659

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From: Central Ohio

I have heard good things from a few folks about the E3 spark plugs. I bought a set earlier this year and planning on trying them out my next oil change later this summer.

http://www.e3sparkplugs.com/

Jun 24, 2011 | 01:46 PM

NoCoLoco

Road Warrior

Joined: Jul 2009

Posts: 1,979

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From: Northern Colorado

Quote:

Originally Posted by bunotz

I want to change the spark plugs on my 2008 Road King. I am looking for any recommendations on a spark plug beside what is listed in the owner’s manual? Thanks

Why, what's wrong with the 6R12's?

Jun 24, 2011 | 03:22 PM

White Ice

Stellar HDF Member

Joined: Nov 2010

Posts: 2,234

Likes: 462

From: Arizona

Quote:

Originally Posted by NoCoLoco

Why, what's wrong with the 6R12's?

Absolutely nothing wrong with them. They're the right plugs for the bike, and cheap as dirt.

Jun 24, 2011 | 03:40 PM

wideopen1967

Tourer

Joined: Sep 2007

Posts: 447

Likes: 1

From: New Bern NC

Never end

This thread will never end. Spark plugs are as touchy of a subject as oil. I am running the E3's (and no my plugs were not worn out). And I noticed a significant difference in the "seat of the pants dyno".

Jun 24, 2011 | 03:44 PM

rocknrod

Ultimate HDF Member

Joined: Aug 2007

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From: Hico, TX (once home to Billy the Kid)

I was thinking of getting those. But I heard rumors that they may not last. You know how rumors are....
There is also 6R12PP (platinum)

Jun 24, 2011 | 03:45 PM

Brooklyn Devil Dog

Road Captain

Joined: Jun 2009

Posts: 696

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From: NYC

Semper Fi, Top. As a former airplane owner, I happen to know a lot about spark plugs and am a maintenance fanatic (I change oil, oil filter, plugs and air filter on my bike every 2500 miles). If you have the same 96" engine I have in my 2010 Street Glide, this is what you want:
- Denso Iridium Fine-Wire Spark Plugs (IXU22 gapped at 0.040") $8 each from rockauto.com
- Harley-Davidson Screamin' Eagle 10mm Phat Spark Plug Wires $20 from Harley

In terms of heat handling capacity, weakest to strongest: copper, gold, platinum, iridium (iridium will handle over 4000 degrees F., 1200 degrees more than platinum). There are basically 2 types of spark plugs: massive electrodes and fine-wires. Massive electrodes are cheaper because they are made of the lesser metals, produce asymmetrically shaped sparks and foul fairly easily. Fine-wires put out a much cleaner spark allowing for better engine performance and increased fuel economy (the Denso center electrode is only 0.4mm thick). Also, the Denso Iridium spark plug has a U-Grooved electrode that puts out a symmetrically round spark allowing for consistent spark production. Check out Denso's website:

http://www.densoiridium.com

Compared to the stock plugs, you WILL notice the difference.

Last edited by Brooklyn Devil Dog; Jun 25, 2011 at 05:14 AM.