NGK CR9EIX - Iridium IX Spark Plug

CR9EIX - Iridium IX Spark Plug

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Rating 4.72 of 5 (22 Reviews)

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NGK CR9EIX - Iridium IX Spark Plug

Delivering performance, durability and anti-fouling capability, NGK CR9EIX spark plugs use an iridium design to give your engine the absolute best.
  • Fine Iridium tip ensures high durability and a consistently stable spark
  • Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines
  • Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties
  • Outstanding acceleration, high fuel efficiency and durability
  • Ultimate design, technology and performance
Plug Specifications
  • Thread Diameter: 10mm
  • Reach: 19mm
  • Firing End: High performance Iridium
  • Resistor type
  • Item # 18398
  • SKU #
  • Mfr. Part #

FitmentView All

Ducati Models

  • 749 : 2004–2005
  • 749 R : 2004–2005
  • 749 S : 2004–2005
  • 999 : 2003–2005
  • 999 S : 2003–2005
  • ST3 : 2004–2005

Honda Models

  • NX250 : 1988–1990

Husqvarna Models

  • TC250 : 2010, 2012
  • TE250 : 2009–2010, 2012

Kawasaki Models

  • GPz1100 : 1997
  • Ninja 600R : 1995–1997
  • Ninja ZX-11 : 1990–2001
  • Ninja ZX-12R : 2001–2005
  • Ninja ZX-14 : 2006–2010
  • Ninja ZX-6R : 1995–2008
  • Ninja ZX-6RR : 2003–2006
  • Ninja ZX-7 : 1991, 1993–1995
  • Ninja ZX-7RR : 1996–1997
  • Ninja ZX-9R : 1995–2003
  • Z1000 : 2004–2006
  • Z750S : 2005–2006
  • ZRX1100 : 1999–2000
  • ZRX1200 : 2001–2005
  • ZZR1200 : 2002–2005
  • ZZR600 : 2003–2008

KTM Models

  • 250 EXC-F : 2011
  • 250 SX-F : 2006–2013
  • 450 SX-F : 2008–2013
  • 505 SX-F : 2007–2008

Suzuki Models

  • DR350 : 1994–1999
  • DR350SE : 1994–1998
  • DR-Z250 : 2001–2007
  • GSX-R1000 : 2001–2006
  • GSX-R1100 : 1993–1998
  • GSX-R600 : 1992–1993, 1997–2007
  • GSX-R750 : 1993–2007
  • Hayabusa : 1999–2007
  • RF600R : 1994–1996
  • RF900R : 1994–1997
  • TL1000R : 1998–2003

Triumph Models

  • Daytona 955i : 2002–2004
  • Speed Four 600 : 2002–2005
  • Speed Triple 955 : 2002–2004
  • Sprint RS : 2002–2004
  • Sprint ST 955 : 2002–2004
  • Tiger 800XC : 2011–2013
  • TT600 : 2000–2003

Yamaha Models

  • FZ1 : 2001–2005
  • FZ6 : 2004–2009
  • FZ6R : 2009–2011
  • TT-R250 : 1999–2006
  • WR250F : 2007–2009, 2011–2013
  • WR250R : 2008–2011, 2013
  • WR250X : 2008–2011
  • YZF600R : 1995–2006
  • YZF750R : 1994, 1996–1998
  • YZF-R1 : 1998–2001, 2004–2005
  • YZF-R1 LE : 2006

Product Reviews 1 - 15 of 22

Overall Rating: 4.72 of 5

(22 Reviews)
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What Other Riders Are Saying...

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Excellent Spark Plug!

I ride a 2006 Harley Davidson Sportster 1200XL with a Screamin Eagle upgrade. I installed the NGK Iridium spark plugs on the recommendation of the mechanic that was doing my 10,000 mile service. Man!! Am I impressed!! Big increase in performance! Bike is running like a bat out of Hyades! :-)

Mike - September 19, 2013

(Webb City, MO)

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Poor Performance for my 2006 SV1000

I purchased the iridium plugs for a 2006 Suzuki SV1000, basically stock. I experienced a marked loss in throttle response noticable from idle and when downshifting. A reduction in power was not detectable by "butt-dyno" but was probably present. The stock SV plug is a dual electrode type and when I installed new stock ones the superior throttle response was restored. However, I was very pleased with the service and price from Motorcycle Superstore and will be back for future needs

Jim - August 15, 2012

(Fort Pierce, FL)

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GSX-R 600

Since installing the iridium plugs I have noticed a smoother and slightly more aggressive bike. I couldn't be happier. The price was great too!

Collin - July 24, 2012

(corvallis, OR)

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Iridium plugs....excellent

Could tell the difference immediately. They're great....just hope they last well.

Tonto - July 18, 2012

(Loudon, TN)

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Works fine in my GSXR750

Shipped on time, install was straight forward, and they worked.

George - June 26, 2012

(Chicago, IL)

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Pretty Good

FZ1 owners - be sure to remove the small "trailer hitch" like ball at the end with a pair of pliers and test fit to a spark plug boot before installing. Seems to run well. It will be nice to not really ever have to worry about changing these now.. but I may just for giggles a couple of years down the road.

Jon - April 20, 2012

(Aurora, IL)

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NGK plugs

Good price, fast shipping.

Brian - April 4, 2012

(Auburn Hills, MI)

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Good Plugs!

I prefer Denso but I went with NGK this time. I've used Iridium plugs since '98. better mpg, smoother, better idle, very long lasting. Only way to go.

Pat - March 26, 2012

(San Fran, CA)

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Excellent Performer

Have these style plugs in a street bike, crusier, and two dirt bikes. They work absolutley perfect, worth the extra cost. You will notice the improvement.

Norm - December 12, 2011

(Atlanta, MI)

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I can honestly feel the difference

I needed a tune up and chose to get the iridium tipped spark plugs over the standard OEM spark plugs. I could feel the difference like that (snapped fingers). I actually feel that the torque comes more suddenly and I've had to get used to holding on tighter or being ready to have the bike leave me. I haven't noticed any differences in gas mileage, but when they say that your output will increase with these spark plugs, they are not just putting up persuasive advertisements.

Andre - May 27, 2011

(Boston, MA)

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NGK Iridium Sparl Plugs

They are quite a bit more expensive than the standard plug; however I noticed immediately how much faster the engine revs than with the standard plugs. My standard plugs were in perfect condition when I changed them. The bikes runs better than ever with the Iridium plugs. Great $35 upgrade.

Tim - May 6, 2011

(Salem, OR)

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definitly for hayabusa

ive used these in my bike for the past 5 years and they are awesome fast start and a little extra power to boot,smooth running at idle and they scream when your throttling the heck out of it only thing is they are cheaper at your local auto parts store but if you order here you can keep riding till they show up...best bang 4 yer buck...

ken - February 22, 2011

(somewhere, TX)

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Quite nice

Picked these up when I decided to do a tune up on the bike. The old plugs were junk; a lot of the electrode had eroded away. These new plugs made a difference. Bike ran smoother, stronger; but again, this is from what were pretty dead old plugs. My coil packs actually grabbed onto a thin threaded stem. The ends of the spark plugs unscrewed with pliers, so it all worked out. Great plugs, can't beat iridium.

Tan - October 4, 2010

(Oak Park, IL)

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Wow - This plug rocks

I have a hopped-up Piaggio 250cc scooter that has a CVT transmission. I pulled out the champion plug and put this puppy into my heavily customized machine and it made a substantial difference in power believe it or not. For those familiar with a CVT driven scooter, you'll understand what I mean when I say the belt seems to bite into a 'higher' gear at lower rpms while accelerating faster in the process. The perfect compliment to juiced up gas and a fuel injection computer on a Leo Vince pipe. I suspect the hotter spark is making better use of my 100 octane fuel formula and the exhaust doesn't smell rich anymore. Highly recommended for scooter and you cruisers better watch out. I sure am passing a lot of you guys on my way to 85mph on a 250 scooter. I'm also getting 70mpg in the process. I think I'll put some of these in my Goldwing 1800 :}

Guedo - July 27, 2010

(Huntsville, AL)

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ngk plugs

I really didn't think these plugs would make a difference in the performance of my bike, man was I wrong. My first ride was like I was on new bike, my 1200 just keeps pulling through all the gears with no hesitating just how I like it, these plugs are the real deal

mike - April 29, 2010

(pembroke, NE)
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