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View Poll Results: What band of sparkplug do you use?
Accel 32 2.97%
Champion 128 11.88%
NGK 327 30.36%
Autolite 89 8.26%
Bosch 17 1.58%
Splitfire 13 1.21%
Denso 31 2.88%
HD 303 28.13%
HD Screamin Eagle (any kind) 137 12.72%
Voters: 1077. 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 1 Week Ago
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 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.
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  #313  
Old 1 Week Ago
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 1 Week Ago
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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 1 Week Ago
Tomcatt Tomcatt is offline
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NGK iridium. DPR8EIX-9.
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