NGK Iridium plugs
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Stock is CPR9EA-9. NGK says CR9EIX is the upgrade replacement.
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Following for future reference. Also, I remember during the early days of the pandemic. Finding them took an act of God. The Yamaha Parts clerk told me to buy a lottery ticket
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3,275 Posts
You can also find them here : SparkPlugs.com: Search
In my recent research I found that the exact NGK iridium plug is the CPR9EAIX-9. The only place I could find them was Japan Spark Plugs. Being obsessive type I obviously ordered them (at nearly 100 bucks shipped for the three).
japansparkplugs.com
Installed them during my recent engine work, engine starts great with very nice throttle response. So about the same as normal only Iridium!😜
JAPANSPARKPLUGS - 1x NGK IRIDIUM IX CPR9EAIX-9
1x NGK IRIDIUM IX Ref. CPR9EAIX-9 N°97673 Spark Plug / Equivalence CPR9EA-9 / DENSO IU27 / IU27A
japansparkplugs.com
Installed them during my recent engine work, engine starts great with very nice throttle response. So about the same as normal only Iridium!😜
Lol
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304 Posts
These will work also and you can probably find them locally...
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![162671]()
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Guaranteed to double your horsepower and cut your fuel usage in half!
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Won't SOMEBODY please think of the oil companies?!
I've gotta sync my throttle body and figured I might as well I'm down there, it'll be the first change since new, about 9k miles ago.
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783 Posts
Isn't this a short life span for sparkies? I mean, not saying you shouldn't do it since you will be in the neighborhood...
I guess my question is, what mileage should one get out of sparkies?
You bought this bike for its mileage? Lol
I think he is asking how many miles the spark plugs will last, not trying to improve gas mileage. I could be wrong.
I'm sure they'd be good to 20k miles from what I've seen other people pull, but I think the manual says like 8k or something like that.
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I'm looking at my Service Manual now, it says replace every 12k. Oops, mine are overdue at 16k miles.
To be honest tho, I'd like someone with some scientific evidence to tell me why I should replace them at such short interval. I ran a Honda Civic to it's stolen death with more than 200k miles on same sparkies with no CONSIDERABLE detriment to performance or mpg.
I'm currently running a Honda Fit to it's death. It has prolly 35k on NGK Iridiums, and again, no detriment to any performance.
I have never changed them before 20k on any bike, insulators always looks good and center/side electrodes have sharp edges. I change them during the valve check/ throttle body sync just because it is convenient when everything is apart. YMMV.
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