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Discussion Starter · #1 ·
Some may have wondered or even been skeptical about whether or nor Iridium spark plugs offer any type of performance gains.
Questions such as "Are they any good?", "Are they durable?", "Are they worth the extra cost?" and "Do they improve mpg?", are common and rightfully so.

Many will say that good old standard copper/nickel plugs work fine for stock bike and fancy plugs won't do anything but make your wallet lighter. In some cases this may be absolutely true, but may be true for one bike may not be fact for all.

Well to answer some of those questions, I needed to find out for myself. Several things most will agree on is that, Iridium plugs will extend the interval between changing plugs, better idle, shorter warm ups, less energy used for ignitability and may not foul as much (compared to standard plugs), and may improve mpg. They also work better in higher compression engines and recommended for use with items such as the Takai Super Coils or other higher output ignitions.

So, last month I replaced my spark plugs. I put in the NGK Iridium CR8EIX (pre-gapped right out the box, I checked). Got them at Advance Auto for $7.09 each. So far the plugs seems to make the bike run well. I can tell a difference in the bikes performance at higher rpms (above 8k) and slightly better idle. Start and warm up time seems to be better in the cooler weather as well (I ride year round). They seem to work nicely with the Pipercross filter & ethanol free gas I run. I guess overall they are burning the gas better which is indicated by the better throttle response. Although there is probably no big overall HP increase, power feels to be generated better. Now, all of this can be from the fact that I put new plugs in, but I don't think so. I ride and maintenance my bike enough to know the difference.

The other day I had a chance to ride in some low 70 degree weather. All I can say is that the cars on the interstate seemed to fall back quicker than normal. Was I going faster? Maybe. None the less, performance was overall better for this particular carbureted bike. For EFI engines, the performance may be different, they may or may not see any change at all (IDK), but for the Ninja 250 and the rich top end, this plug may offer the benefit of better combustion.

I liked these new plugs so much, I bought a second set. They happened to be on sale for $6.09 each. It'll be a while before I change plugs again, but you never know. For $7 more than I would pay for a set of standard plugs, I got a small bump in performance and an extended change interval. Not bad considering some spend hundreds for things like slip on exhaust for a small boost and noise.

I'll see how they run when the weather starts getting much warmer. I have a feeling I won't be disappointed.
 

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Spark plug change...:facepalm:
I see the book says every 7500 miles....dam...:facepalm:
That's not very long on a plug, and....
What a pain this is....:facepalm:
Tank, airbox, side covers...... Just to change plugs.....:facepalm:
Do the NGK Iridium plugs last any longer then stock?
I see my valves need adjusting every aprx. 15,000....
Even tho my dealer says 20-25,000.....
Be nice to have valves adjusted n plugs changed at same times...:thumb:
Seeing it all has to come apart then anyway.
Suggestions anyone.....
Seeing most of u have been at this a lot longer than i have with these Ninjas.....:dance::dance:
7500 miles seems awfull short a life on a plug?


http://shop.advanceautoparts.com/we...&utm_campaign=enhancedrm&utm_content=18090172








 

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[FONT=&quot]Hello Earl, [/FONT]

[FONT=&quot]The 2012 Kawasaki 650 uses an Laser iridium CR9EIA-9 #6289. You can use a Competition Racing R0373A-9 #3388. This has a platinum ground electrode and will double your service life to 15K , but they are expensive($80/ea). [/FONT]

[FONT=&quot]Best Regards, [/FONT]

[FONT=&quot]Andrew Hauenstein[/FONT]
[FONT=&quot]Product Specialist[/FONT]
[FONT=&quot]NGK Spark Plugs USA Inc

DAM!!!!!!
I mite have to get a scooter...
[/FONT]









 

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The Iridium plugs last longer than regular stock nickel plugs, 20-30k miles (depending on application). They cost between $8.00- $10.00 each.
Great.... Those came in the bike stock, so i'll be good till my first valve adjustment.
I'll have dealer change them out then. Dam i was getting a bit worried bout cost to own one of these.....:facepalm::facepalm:
N i don't even run it hard.:rolleyes::rolleyes:

Thanks.......4 info....:thumb::thumb:








 

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Blue Ghost... my testing was similar to yours. Take it for what it's worth but I bought two sets of plugs, standard and iridium both NGK. I put in a brand new set of standard drove for one tank of fuel back and forth to work for a couple weeks.

Next tank swapped out brand new plugs for iridium. Thought to myself... they are still new, I will throw them back in after I use and prove iridium don't make a difference. Noticed an immediate difference in idle and throttle response from the brand new plugs I had in there. Next tank showed mileage improvements back and forth to work. I know it's neither here or there, questionable testing but the difference was enough to notice and the mileage changes have been consistent. Not turning back and unfortunately these nickle plugs are gonna stay on the bench.

I too have to give the nod to iridiums, even if it is only seat of the pants feel. :) Shrug take it all for what it's worth.
 

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NGK iridium came in mine stock. My dealer wants 110 bucks for a new set installed....:facepalm:
At that price i'll do them myself, even tho it's a pain in the ass to get to.:eek:
Remove tank n airbox n most likely both side covers?
Piss poor design 4 sure....:nonono::nonono:
But I sure ain't got the $$$ to pay the dealer to do everything.:banghead::banghead:
So sometime i'll order plugs online.....:thumb:
N on a rainy day or two rip it apart.....:dance::dance:
OK..... Where'd i put my hammer n prybar.....:whistling::whistling:








 

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NGK iridium came in mine stock. My dealer wants 110 bucks for a new set installed....:facepalm:
At that price i'll do them myself, even tho it's a pain in the ass to get to.:eek:
Remove tank n airbox n most likely both side covers?
Piss poor design 4 sure....:nonono::nonono:
But I sure ain't got the $$$ to pay the dealer to do everything.:banghead::banghead:
So sometime i'll order plugs online.....:thumb:
N on a rainy day or two rip it apart.....:dance::dance:
OK..... Where'd i put my hammer n prybar.....:whistling::whistling:
$110!!! Holy! Yeah... it is a pita but $110! Never thought that expensive but I guess so! What Racer X said about the aftermarket coils allowing for plug changes with the tank still on made me think about making my life easier for future plug changes.
 

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$110!!! Holy! Yeah... it is a pita but $110! Never thought that expensive but I guess so! What Racer X said about the aftermarket coils allowing for plug changes with the tank still on made me think about making my life easier for future plug changes.
Ok...... I'm not sure yet what kinda pain in the ass they will be, but when i do my oil change in another 4000 miles i'll have the side cover off anyway so i'mm gunna look close to see.
But from what i got from info from dealer the airbox has to be removed.
So that means tank too...
I have the upright handlebar 650 n the airbox is most likely diff than the R models...?
I'll take some pics when i do get to doing that like i did be4 doing the air filter....

http://www.newninja.com/forums/f104/2012-ninja-650-air-filter-change-8422.html








 

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Discussion Starter · #14 ·
..... My dealer wants 110 bucks for a new set installed....
:eek:

That's a bit much for a set of $20 plugs. BTW you may be able to get the plugs at an auto parts store instead of online. The CR9EIX will work as well. The only difference is one(CREIA-9) is marked for OEM applications. It has Platinum on the ground electrode and Iridium on the tip. The CR9EIX has Iridium on both the tip and electrode.
 

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:eek:

That's a bit much for a set of $20 plugs. BTW you may be able to get the plugs at an auto parts store instead of online. The CR9EIX will work as well. The only difference is one(CREIA-9) is marked for OEM applications. It has Platinum on the ground electrode and Iridium on the tip. The CR9EIX has Iridium on both the tip and electrode.
NGK Iridium IX® Spark Plugs

Doesn't say anything bout Iridium on both the tip and electrode?








 

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From NGK.......



Hello Earl,

The 2012 Kawasaki 650 uses an Laser iridium CR9EIA-9 #6289. You can use a Competition Racing R0373A-9 #3388. This has a platinum ground electrode and will double your service life to 15K , but they are expensive($80/ea).

Best Regards,

Andrew Hauenstein
Product Specialist
NGK Spark Plugs USA Inc









 
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