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NGK Iridium Sparkplug

This is a "machine-selection optional" part.Please choose a vehicle to see the options specific to your machine.choose from all of the options below and add to cart.

Fits Your MachineDisplaying parts for your 1984 YAMAHA YZ80
NGK Iridium Sparkplug BR9EIX
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NGK Iridium Sparkplug BR9EIX

Fits: 1984 YAMAHA YZ80

Part# 1021740006 | Mfg Part# 3981

Our Price: $9.99

MSRP: $13.04 - You save $3.05 (23% off)

Get $0.50 in Quick Cash

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Details

  • Laser Iridium® spark plugs provide superior ignitability and long service life. Smallest tip diameter available Iridium surfaces ensure slow wear rate providing stable idle, superior anti-fouling, improved fuel efficiency and lower emissions.
  • Laser welded Iridium center electrode tip.
  • Platinum disc welded to backside of ground electrode provides long life.
  • Trivalent Metal Plating for superior anti-corrosion and anti-seizing.
  • Faster starts and quicker acceleration.
  • Better fuel economy and lower emissions.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

NGK Iridium Sparkplug Reviews

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4.9 / 5.0
521 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
471
40
7
0
3
Value
4.7 / 5
Performance
4.9 / 5
Recommend it?
Yes (203)
No (2)
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Sweet
Ordered this to replace the old factory regular NGK spark plug and what a difference. Definitely worth the couple of extra bucks.

-m-2019 YAMAHA GRIZZLY 90--
April 28, 2020
WOLCOTT, CT, US
Age: 25-44
Purchased
1 month ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
My Favorite Plug
They resist fouling better on the kids' 2 strokes. They run great in the 4 strokes and are my favorite plugs to use. All around, the bikes run and start better with these plugs.
April 27, 2020
West Jordan, UT, US
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
It works
Hardly need to change plugs in bikes any more but was shimming valves so figured I'd might as well.
April 25, 2020
Ardmore, OK, US
Age: 45-64
Purchased
over 3 years ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Good plug
Great plug i feel the iridiums make the engine start a little faster and smoother idle
April 25, 2020
Visalia, CA, US
Purchased
7 months ago
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Love these
Awesome always solve the fouling problems. Amazing throttle response.

-m-2016 YAMAHA YZ250--
April 20, 2020
Jamestown , NL, CA
Age: 15-24
Purchased
1 month ago
Gender:
Male
Weight:
131 - 160 lbs.
Height:
5'7 - 5'9
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Good plug
This is the recommended plug for my bike. It works good
April 18, 2020
Corydon, IN, US
Age: 25-44
Purchased
1 month ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Performance
5 / 5
NGK iridium plug
Great plug.Solid.fires right up everytime

-m-2006 HONDA CRF450X--
April 15, 2020
Santa Clarita, CA, US
Age: 45-64
Purchased
2 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Good soark plug
Works,nice,seems to give bike more power.

-m-1990 YAMAHA XT600--
April 12, 2020
Deadwood, OR, US
Age: 45-64
Purchased
2 months ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
Great product
The plug showed up quickly, and were exactly what I wanted. They work great.

-m-2016 INDIAN Chieftain Dark Horse (ABS)--
April 8, 2020
New Fairfield, CT, US
Age: 45-64
Purchased
2 months ago
Gender:
Male
Weight:
>281 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Performance
5 / 5
Recommend it?
Yes
You get what you pay for!
Instant start after install! Have only had a week so I can’t speak to other aspects but I’m sure I’ll be impressed
March 31, 2020
Meridian, ID, US
Age: 25-44
Purchased
2 months ago
Gender:
Male
Weight:
221 - 250 lbs.
Height:
6'1 - 6'3
Show more
Rocky Mountain ATV/MC gift card Each question or answer submitted enters you into a:
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$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 21 questions Browse 21 questions and 41 answers
your sure this fits a 07 rmz450?
A shopper on Jan 2, 2017
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2017 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
Does the end screw off of this plug? This end want fit my wire. I need the end that is small with threads.
Steven H on Jan 9, 2018
BEST ANSWER: Been a while since I've bought this one but have used NGK for years and cannot remember one that did not screw off exposing the tip you need.
Which are better overall these or the e3 plugs?
Bailey A on Dec 26, 2018
BEST ANSWER: Without defaming a brand, in my opinion the solid brands from a overall reliability and performance point of view would be NGK, Denso, Bosch, I feel that some of the other brands are purely marketing. An example would be split fire, they guaranteed a performance increase but if you read the guarantee it voided if you dyno tested... lol so how do you quantify performance. I’d recommend sticking with ND or NGK for a bike.
Does this plug come with a terminal nut?
Rolando H on Apr 2, 2018
BEST ANSWER: I don't believe it comes with a terminal nut. If I recall, it only comes with a threaded terminal stud with a terminal threaded onto it. No nut though.
What size is this plug? I mean what size wrench will fit it? Since there are different plug sockets. SIMR8A9
Barry S on Dec 11, 2019
BEST ANSWER: 14mm. I got a long deep socket (air tool deeper than regular socket) at Lowes that works on a 990
Can I replace my non-resistor type B8ES plug with the BR8EIX plug? On a 1986 kawi bayou 300.
jacob M on Nov 24, 2019
BEST ANSWER: They are both resistor type
Is the plug pre gapped?
Gage E on Oct 29, 2019
BEST ANSWER: Yes
Is this recommended for a 05 crf450r with a13:1 high compression piston installed?
A shopper on Nov 16, 2018
BEST ANSWER: This is a question for a professional performance engine builder. You will most likely need to adjust your heat range due to higher combustion temperatures. I use these in my 2 stroke for better resistance to fouling.
is this plug direct fit for yz 125 1977?
mike c on Jan 6, 2017
BEST ANSWER: Yes, this will fit your machine. To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2017 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
is14mm the correct size socket for installation/removal of this plug?
A shopper on May 12, 2020
BEST ANSWER: It is the correct size but depending on machine type may required a special socket.
Does this fit a 2017 raptor 90cc?
A shopper on Oct 7, 2019
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application.
Will this plug work in my 07crf250r ??
Nathan B on Sep 22, 2019
BEST ANSWER: Unfortunately, we do not have this sparkplug available for your machine at the moment.
Will this fit my 03 yz125 with a Athena 144 big bore kit if so what is the correct gap? It’s a me bike for me
Michael P on Jul 10, 2019
BEST ANSWER: Yes especially if it’s made for it. Gap should be anywhere from .7-1.1mm
What sparkplug do you use on ktm250sxf 2019 model?
A shopper on May 10, 2019
BEST ANSWER: Your sparkplug is LMAR9AI-8. If you enter in your make, model, and year above the product image it will come up.
On my 2019 yz125 spark plug is BR9EVX, but i dont see any on here,, can i use the BR9EIX,, is that the same but much pricey?
manuel c on Apr 23, 2019
BEST ANSWER: They are the same size plug just a different model number.
Do you stock ngk SILMAR7A9S plugs?
A shopper on Mar 29, 2019
BEST ANSWER: Unfortunately, we do not carry this plug.
I have a 2004 Honda trx 450r, if I have the bike registered and looking at parts for it yall will know what plug to send me for my bike?
A shopper on Feb 6, 2019
BEST ANSWER: Yes, just enter in your make, model, and year and it will give you the stock sparkplug.
I need this plug for a 1999 KTM EXC 250 two stroke. Dont see it listed?
Brian A on May 15, 2017
BEST ANSWER: I looked into this for you and it looks like we only carry the Resistor Sparkplug for your machine.
NGK Resistor Sparkplug
NGK Resistor Sparkplug
Will this plug fit 2017 polaris outlaw 110cc?
A shopper on Jan 31, 2017
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2017 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
Does this have to be gapped for a 2007 rmz 250?
Derek E on Oct 27, 2016
BEST ANSWER: These plugs come pre gapped.
I have a 686 big bore kit installed on my 04 660 raptor will the heat range on the plug displayed for this machine be sufficient?
Allan W on May 23, 2020
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