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Discussion Starter · #1 · (Edited)
Hey guys....
So I went and bought new oem duel ground NGK plugs for the 12,,,
and have heard mixed reviews on them......
Plenty of people say use the ngk iridium's instead???
any thoughts
?

SO how many of you....dont bother with the duel ground plugs? and have switched to ngk iridium ?
 

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Multi-electrode plugs can't have any advantage because the spark will take the path of least resistance and only go to one. There may be a slight disadvantage in that the unused electrodes may mask the spark from different angles in the combustion chamber. If they were somehow better, single-electrode plugs would have gone the way of the dodo. And they clearly haven't.

the Iridiums should last longer than a conventional plug which makes up (somewhat) for their premium price.
 

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preference is yours.

most people dont like the "multi" ground like the 4 prong/3 prong ground because they cannot be gapped, but if installed correctly as in installing the correct one with the proper preset of your bike then you get the benefit of logevity with a consistent spark for consistent fuel consumption the irridium multi prong can be gapped, so i dont see a reason not to get it if you can spend the extra cents.

HOWEVER!!!, multi ground spark will still park just enough volt as supplied by your plug wires, if you want the performance then you would have to replace your wires as well. dual ground/multi ground will still provide only 1 spark from 1 prong. Some people call it a marketing scam since spark usually comes from 1 of the prongs more of then than the rest the distance of the prongs are never 100% perfect.
 

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Like everyone has said the multi ground can only use one at a time. I always use NGK Iridium IX, not laser oem iridium. Also do not gap the iridium plug. These come pregapped. If you want a different gap the part number will change. The IX plugs are not horrible in price, usually run about $10 and have seen as low as 7-8.
 

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DUAL grounding spark plugs are designed to prolong the life of the spark plug. As the spark travels to the path of least resistance then there is electrode erosion. The spark will then travel to the other ground and then go back and fourth for even erosion. Therefore the spark plug lasts longer. This was designed for high performance engines that would burn out a single grounded standard plug due to the higher heat and energy systems.

Iridium is the way to go because you will have a spark plug with the same lifespan (if not longer), but it will have a more concentrated spark, more consistent spark, and resists fouling.

 
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