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Iridium Plugs

Re:iridium, all I have to share is a lot of liquid cooled 2 stroke snowmobile experience. There, they were known to run more consistently, without fouling.
 
Well, on my BF 225 they make a big difference. About 12 years ago I accidentally replaced my plugs with non-iridium plugs and the motor ran like crap.
 
I'm no expert on spark plugs but my understanding, from what I've read about them, is that they were first developed for longevity in high temperature performance engines. They were part of the "100,000 miles before replacing/tune-up" ad campaigns in some automotive engines several years ago.

I ran them a bit longer than that in my GDI (GAS Direct Injection) engine and they looked really good when I replaced them.

Expensive....YES!
Laser iridium are even pricier.
 
Here's fact Jimmý
Honda have gone back to standard spark plugs, I don't know why but they have.At our marina they were selling fuel containing ferrocene as an anti knock additive.We were getting less than 50hrs from iridiums but normal longevity from standard plugs.It seems irridiums are great if not subjected to contaminants.I do still use them but this thread was questioning what to use in a 250 and was there any difference in performance
I can assure you there is no noticeàble difference to the operator other than price.
 
Ian,

I take, from your tone, that you weren't at all pleased with my contribution to this thread. Which, I suppose, I mistakenly thought was a discussion about iridium plugs but is apparently more about the 250 and iridium plugs?
Ok, my bad....I guess.
 
Not at all Jimmy. always value your contribution
I was simply stating a fact. I have found irridiums don't generally last the 400hr recommended service interval and for that reason using the standard plugs as fitted from factory on the lateŕ Honda's is more economical
 
It's pretty much been disproved to the point that the FCC has gone after companies like E3 for claiming that their spark plugs will improve performance. There aren't any measurable performance differences from one plug to another. What makes the difference, as noted, is fouling and longevity. In fact you could argue that plugs of one brand or another produce less performance loss, rather than gain. This assumes the plug being used is the one the factory calls for.
Saying the engine "runs better" probably means the plugs that were in it were highly degraded before replacement.
 
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