Don't buy them. it ain't the kind of purchase worth mulling over the pros/cons here. but here goes...

HP & milage claims are anecdotal and unreliable. Copper conducts better, its a performance choice. Iridium is much harder but less conductive, its a longevity choice.

Since, you're a long way from high mileage i assume you keep to the factory recommended maintenance schedule & intervals. By doing that you are guaranteed to waste the only benefit of buying iridium in the first place.


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No need, unnecessary.

 

Darn things would have to give me 5hp to be worth the work and expense required to swap.

 

My votes go Brisk LGS plugs

 

Iridiums are a yes....................... YES


for 20% more cost you get twice the life..........

Who gives two fucks if there are no other benefits other than financial incentive(even though there may be some)

 

I tend to be the overzealous type when it comes to maintenance so longevity really isnt a perk for me but i do have a question for you since you see a lot of bikes:

for track/race ive always run copper plugs, supposedly for a larger spark/flamr front. i know on older carbed bikes like my sv that iridium plugs would foul out very quickly due o so much time spent WOT and richer fuel mixtures. have you noticed anything like this?

 

I put some new iridiums in my 2013 R1. They cost me $15 each. The change interval that was in the service manual stated changing the plugs every 8,000 miles. What the hell? 8,000 miles on a set of iridiums, Damn that's a quick change and an expensive plug. The bike has 6,800 miles and I am getting it dynoed so an air filter, smog block off plates and new plugs were in order. Expensive games we play.

 

I don't believe the gain in HP, but if they are going to last longer than the ones that came in the bike, I don't mind paying more for them.

 

Thanks for the insight all. Have to decide shortly.

 

The thing with plugs that I have noticed is that you never really feel them going bad. They slowly decline and then you replace them and realize that throttle response is better with the new plugs. That's all unless the gap is large enough to make the bike run like shit. But no real performance gain other than increased throttle response. Especially on a MX bike with a single cylinder and short stroke.

 

No iridium plugs for me. 16$ for all four at the local auto parts store so I just change them at service intervals.

 

I replace my plugs every major service so no point putting the long live plugs in there.

 

The service intervals are based on standard plugs.
Standard plugs degraded to the point of hurting performance.
Iridium plugs do not degraded the same. The materials are that much better.

If your fueling is bad, if the voltage needed to produce spark isn't there then the plugs won't perform properly or prevent fouling. They are not a miracle cure.

If you like tinkering, if you like replacing parts then get stock plugs.
I enjoy fixing things, but have enough other things to do this is something I can gladly skip with a better plug. I'm in.

Side note, my car came with iridium plugs. Said 100k mile change.
At 125k I changed them. the car was running fine. Noticed the gap had increased from a new plug.
Small increase in performance and MPG after changing them.

 

Iridium plugs allow the use of smaller electrodes. Same is true of platinum to a smaller degree. The harder materials just last longer. This is the only benefit of the harder material. But a smaller electrode has big benefits. The sharper electrodes allow the ionization to be focused in a smaller area, allowing for less spark energy requirements. This leads to less potential for misfires. Additionally, smaller electrodes also reduce the quenching effect. That is, the heat generated from a spark can be reabsorbed into the electrode. This affected greatly by the surface area of the spark plug electrode near the spark. A thinner electrode has less surface area. While misfires don't often occur in a healthy engine, and would have a negligible effect on performance.

I run iridium in mine. But it has nothing to do with performance. I found the valve adjustment interval is not inline with the spark plug change interval. I run iridium plugs so I can line them up. In fact, I had bought a set of the OE plugs only to not put them in when I thought about having to tear into the bike that far. If only I could extend the air filter interval, I'd be golden as I'd only have to remove the tank once to get to all of that.

I should also mention that I bought the iridium plugs on sparkplugs.com for about the same price as the OE plugs at the dealer.

 

Didn't know about these,, wow real proud of them.

Iridium Racing® | DENSO Auto Parts

 

Anyone used E3 spark plugs?

zx6r model E3.38 Spark Plug

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