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Hornet Grandpa!
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271 Posts
I think at the very least you may get more life with less changes. I don't feature going in after plug #3 on the 919 if I don't have to.

Doc
I installed them because they last longer, not because they perform better. However, I guess you could say the perform better as the standard plugs age and wear.
 

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77 Posts
the only thing iridium plugs do is last longer .like 200,000 miles in a chevy tahoe.i seen it myself .no performance improvement .
Not sure about the 919...but on both of my Toyota vehicles iridium does make a differnce in life. Camry - owners manual lists 90K using Denso iridium ($12 each), Tacoma - 30K using non-iridium ($3.50 each)...

In all of my rigs I always replace with OEM.
 

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I bought my bike with 15000 miles on it and I changed my plugs at 45000 miles. They looked bad but bike ran ok. After so many miles you will feel difference, now I am approaching 70k and changing them again...
 
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