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View Poll Results: What band of sparkplug do you use?
Accel 32 2.95%
Champion 128 11.81%
NGK 333 30.72%
Autolite 89 8.21%
Bosch 17 1.57%
Splitfire 13 1.20%
Denso 32 2.95%
HD 302 27.86%
HD Screamin Eagle (any kind) 138 12.73%
Voters: 1084. You may not vote on this poll

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  #311  
Old 23rd October 2019
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Joe_jeep Joe_jeep is offline
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the plugs in my 2010 xl1200 low are rusty and look horrible!
they appear to be hd factory plugs with 4500 miles on them.
it runs great, so they are at least a decent plug.
im sure most name brand plugs will function fine in my stock bike,
but what plug will be least likely to rust, and look bad?

normally i am a fan of autolite iridium plugs.
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  #312  
Old 24th November 2019
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glbsportster glbsportster is offline
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If you have ever wondered why you gap an iridium at .035 and a copper one at .040. read the following and it will help you know and it is also why I use a NGK or HD standard copper plug.

Purpose of the Metal
The metal in a spark plug serves a single basic purpose: to channel the electric energy from the plug wire through the spark plug so that it can be forced to the engine block in the form of a spark. Therefore, any metal that conducts electricity at all could potentially be used for a spark plug. The metal should also not get too hot; one of the main problems with some metals is that they overheat quickly, causing the electric charge itself to be compromised and the spark plug to not operate as smoothly.
Copper Spark Plugs
Copper spark plugs are generally considered to have the best performance of any spark plug type. This is potentially different from what advertising companies suggest, but the other metals are, unfortunately, not as conductive in general as copper is. Platinum and iridium plugs are more likely to overheat, which causes damage to the plug components and can compromise the delivery of the spark to the engine block.
Platinum and Iridium Plugs
Platinum and Iridium plugs perform at a lower level than copper spark plugs, because they are less conductive and they tend to overheat. However, the overall longevity of these two types of metal is better than copper plugs. In reality, copper has the best performance of all three and the worst longevity. Platinum has good longevity and the worst performance. Iridium has good longevity and a performance that is decent, which is why iridium plugs tend to be more expensive than any other type. Still, the difference between these plugs in terms of overall quality is minimal, as there is a trade off for each.
Most copper plugs need to be changed every 20,000 miles or so. Platinum and iridium plugs can often go for twice that before they require changing, but the overall performance will not be as good and you may have to deal with overheating of the plugs. This is potentially not worth the added cost of both platinum and iridium spark plugs, although the decision will depend upon your preference.

Last edited by glbsportster; 23rd February 2020 at 05:30..
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  #313  
Old 24th November 2019
Four Speed Four Speed is offline
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Hmm, not sure where you got your information. There is plenty of manufacturers data to suggest otherwise.
The finer tip of an Iridium plug offers superior ignitability, hence their use in modern ultra lean burn engines.
The 'copper' refers to the "core" which transfers heat away from the tip better. Iridium plugs are a premium
product and NGK, Denso Iridiums etc have copper cores anyway, so the actual difference is Nickel v Iridium tips.
The Iridium tip has several advantages over nickel. Hard wearing, less fouling and because it can be made much
much thinner it quenches the spark a lot less to the extent that it can fire at about 5KV less than a traditional plug.
That is a big advantage on a MC where the ignition systems are often not as powerful. Iridium plugs can be run
closer gapped as there is less shrouding of the spark. But as you say you pays your money and makes your choice.
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  #314  
Old 24th November 2019
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The Iridium tips were designed to combat the effects that "ethanol gasolines" have on spark plugs. When Platinum plugs were introduced, the Car manufacturers could claim 100k miles on the plugs. When ethanol became widely introduced it shortened the plug life by up to 50%. The introduction of iridium plugs lengthened plug life back up to 100k miles. The goal of the Car manufacturers was to make cars that only need service every 100k miles. (not good for us mechanics)
As far as my bike goes, I try not to use any ethanol mixed gasoline as it seems less forgiving in a motorcycle than in a car. I use the Harley Plugs in my bike and change them every other year. In my '81, I used Autolite after experimenting with different brands. A lot of friends use different brands because, I think, the upgrades you have and the way you ride make a difference in what plug works best.
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  #315  
Old 24th November 2019
Tomcatt Tomcatt is offline
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NGK iridium. DPR8EIX-9.
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  #316  
Old 22nd February 2020
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I replaced the ones that came on the bike when I bought it at 2200 miles. I had NGKs in my toolbox from a Dyna I used to own and used them. The difference was notable when I took it for a test drive. The throttle at idle response was a bit flat before I changed them. After changing them the flatness was gone. Heres what the old ones looked like:

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  #317  
Old 22nd February 2020
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I use what is considered the standard NGKs and they seem to work the best in my cycle.....and am sticking with them.....but I have never had any come out of my Sportster's engine looking like yours and am wondering what your NGKs would look like after 1,000 miles, I think I would check them. My engine is considered stock so maybe that has an impact on what plug to use and it seems many individuals use mostly subjective decisions and criteria on which plug works best for them and that includes me.

Last edited by glbsportster; 22nd February 2020 at 14:36..
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  #318  
Old 22nd February 2020
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I will be changing mine out at the manual's recommended interval of 2yrs or 30k miles. The bike is a 2016 with 2200miles and sat a lot with frequent start and stops. The air filter was dirty and loaded up with blow-by. The oil was thick and viscous but then I'm in Colorado and 50w will look like axle grease in these temps. I have no way of knowing if any services were done to at all. It's what you encounter when you buy a used bike even the low mileage ones. It's now getting the attention it should have gotten and I will be running it the way it should be.
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  #319  
Old 22nd February 2020
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Ngk dcpr7e..
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  #320  
Old 22nd February 2020
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I take my plugs out every 3 months....just to look at them and see if things are as they should be.....plus I change them annually (since I use only standard copper plugs} and they are relatively cheap and it is easy to do.
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