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  #11  
Old 8th August 2019
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Toejam503 Toejam503 is offline
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The Harley-Davidson spark plugs are made by Champion to Harley's specs. If you put them side by side, you'll see the "Harley" plugs have an extra round of threads on certain sizes (longer reach).
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  #12  
Old 8th August 2019
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Quote:
Originally Posted by Highly-Dangerous View Post


Batteries = Deka.... but I use a Lithium one.

Oil Filters = Champion Laboratories also.... but I prefer to use K&P

Air Filters = Not too sure... but I prefer to use K&N.

I found a whole thread about where batteries are made.

https://www.hdforums.com/forum/gener...the-usa-5.html

One poster who claims to work at Harley says: "Johnson controls are the oem supplier for harley batteries"

But let's not steel the plugs thread! Sorry!
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  #13  
Old 8th August 2019
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NGK gives them a life expectancy of 40-50k miles. But they have to temper their projections as driving conditions and motor modifications differ. Typically we have found you can expect 60,000 to 80,000 miles on an unaltered motor.

https://www.ngk.com/learning-center/...ium-plugs-last

It's what you prefer: You can change them regularly for copper ones with the same costs of never change them.
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  #14  
Old 8th August 2019
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I had one of my Iridium plugs fail at < 10K miles. Could be an outlier.
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  #15  
Old 8th August 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by NLXL View Post
Yeah, I thought so but wasn't sure. Maybe it would save us some money if we knew where 'Harley' batteries, oil, oil filters and air filters were made...

Thx!
Sometimes you will save money by shopping aftermarket and sometimes you won't. I was looking at some Harley helmets in a dealership and saw two of them identical to my HJC models at the same price that I paid. Go figure.
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  #16  
Old 11th August 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by Bored now View Post
I had one of my Iridium plugs fail at < 10K miles. Could be an outlier.
The iridium plugs cannot be gapped like standard plugs because the wire is so fine and delicate. Possibly damaged during gapping?
https://cv-performance.com/ngk-6046-...ium-spark-plug
I've been using NGK plugs for over 40 years and iridium plugs for over 10 years and this is the first time I have ever heard of any kind of failure of any NGK spark plug.
The worst performing plugs I've ever used are Bosch and Champion.
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  #17  
Old 11th August 2019
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Quote:
Originally Posted by boomerguy View Post
The iridium plugs cannot be gapped like standard plugs because the wire is so fine and delicate. Possibly damaged during gapping?
https://cv-performance.com/ngk-6046-...ium-spark-plug
I've been using NGK plugs for over 40 years and iridium plugs for over 10 years and this is the first time I have ever heard of any kind of failure of any NGK spark plug.
The worst performing plugs I've ever used are Bosch and Champion.
Not gapped, I know not to do that, could be a complete one off failure, I have never heard of another one.
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  #18  
Old 11th August 2019
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Iridium plugs also use copper cores, so the the issue really is what tip. There is good date to support the claim that
Iridium plugs fire at up to 5KV lower as the smaller tip is less quenching than the much larger nickel tip. That can be
useful on a MC that typically has weaker ignition than a modern car. So I use Denso Tough that are rated for about
100K. They combine a 0.4mm Iridum tip with a platinum earthing pad. Never needed to gap in six-years them but I
do clean them one a year now in the ultrasonic tank.

Bored now, I once had a duff Denso Iridium from new; the resistance was well out and they changed it without hesitation.
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Old 24th August 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by Bored now View Post
Not gapped, I know not to do that, could be a complete one off failure, I have never heard of another one.
This is from NGK. Read the paragraph that starts with, "NGK plugs are no longer factory gapped."

https://cv-performance.com/ngk-6046-...ium-spark-plug

They can and should be gapped but with a special gapping tool.
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  #20  
Old 25th August 2019
Four Speed Four Speed is offline
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Maybe CVO know something that NGK don't. This is from the actual NGK website, read the sentence that starts with:
Quote:
Although the NGK factory will set the gap to a preselected setting, this may not be the right gap for your particular engine
https://ngksparkplugs.com/en/resourc...ling-new-plugs
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