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Old Aug 9, 2012 | 12:07 PM
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Default Spark plugs
Was wondering what is the best spark plug to use! Have the HD plugs on my 2007 ultra classic. Any info would b greatly appreciated!
 
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Old Aug 9, 2012 | 12:30 PM
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Use the standard HD plug, resistance has to be at the right amount or it could affect ECM. Nothing measurable to be gained by other brands other than possible problems.
 
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Old Aug 9, 2012 | 12:40 PM
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Ive used multiples of plug names in the past.. NGK, Champion, HD, Autolite, Bosch, ... including Copper, Platinum, Iridium & havent seen a difference in any of them. Perhaps theres a difference in a high HP dyno shoot out.

Currently I have the cooler HD V-Rod Plat plugs in & it runs just fine.
 
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Old Aug 9, 2012 | 12:45 PM
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Thanks guys!!!
 
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Old Aug 9, 2012 | 12:46 PM
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Originally Posted by Fast Aire
Ive used multiples of plug names in the past.. NGK, Champion, HD, Autolite, Bosch, ... including Copper, Platinum, Iridium & havent seen a difference in any of them. Perhaps theres a difference in a high HP dyno shoot out.

Currently I have the cooler HD V-Rod Plat plugs in & it runs just fine.
Me too.....went to a cooler plug when I was troubleshoot my pinging problem. Feel no ill effects whatsoever.
 
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