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OEM vs NGK Iridium Spark Plugs


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My bike just hit 20k km and it is time to change the spark plugs.


Do I go with OEM or NGK Iridium?

If NGK Iridium can last more than 20k km, i might choose Iridium.


But, isn’t it good to switch whatever spark plug every 20k anyway?

Edited by Oxxa
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Some do and you can, but it will make absolutely no difference.  Personally, I swap things out when the manual says to swap them out, so if I put Iridium plugs in I'd still swap them at the same mileage amount anyways.  I'd be uncomfortable leaving them longer because while ostensibly they last longer, I don't know exactly how much longer, and frankly spark plugs are cheap. 


Honestly, I'd just put in regular OEM plugs.  Yamaha specced those for a reason, and they work well.  We like to think we're "going the extra mile" getting the expensive versions for replacements, but it's not going to make the bike run any different.

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From a test in a dutch motormagazine where they compared oem vs iridium sparkplug, the testers found out that the motorbike with iridium sparkplugs run a bit smoother and had some better fuel consumption. Depends how longer you can use the iridium sparkplugs, it can pay off. I will change to iridium with my next service, just to try.

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