Work with a Yamaha wr450f?

no it does not , the best way to check what plug fits your application visit , www.ngk.com . hopefully this helps

Will this work on a 2004 Yamaha yz450f?

Yes this will work in your YZ450F

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NGK (4218-4PK Iridium IX Spark Plug, (Box of 4)

Product ID: 27237536

Details

Brand
NGK
Core Material
Platinum
Thread Size
8mm
Top Material Type
Metal
Vehicle Service Type
Car Truck

⚡0.6mm Iridium fine tip for stable spark

🔥High melting point Iridium alloy for heat durability

🛡️Triple gasket seal prevents combustion gas leaks

¥10722

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite your drive with NGK Iridium IX – where precision meets power!

RACE READY DURABILITY - Iridium alloy withstands intense heat and electrical wear, engineered for high-performance engines that demand reliability.
THROTTLE RESPONSE BOOST - Optimized tapered ground electrode minimizes quenching effect, enhancing throttle responsiveness and acceleration.
PRECISION IGNITION POWER - Laser-welded 0.6mm Iridium tip delivers extreme ignitability and consistent spark for peak engine performance.
CORROSION SEIZE RESISTANT - Trivalent metal plating ensures superior anti-corrosion and anti-seizing properties, extending spark plug lifespan.
FOULING FLASHOVER DEFENSE - Longer insulator nose and corrugated ribs prevent fouling and flashover, keeping your engine running clean and smooth.

NGK Iridium IX Spark Plugs (4-pack) feature a laser-welded 0.6mm fine Iridium tip for superior ignitability and durability. Designed for performance enthusiasts, they improve throttle response and resist fouling with a longer insulator nose and corrugated ribs. The high melting point Iridium alloy and triple gasket seal ensure heat resistance and combustion gas leak prevention, while trivalent metal plating protects against corrosion and seizing. Perfect for high-performance cars and trucks seeking reliable ignition upgrades.

Specifications

ASIN	B000BYERAO
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#1,311,238 in Automotive ( See Top 100 in Automotive ) #6,499 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Car, Truck
Core Material	Platinum
Customer Reviews	4.5 4.5 out of 5 stars (216)
Global Trade Identification Number	00087295042182
Included Components	Automotive accessories, Underwood parts, Performance Parts
Item Highlight	Replaces 297921 0297921 AP0297921 90793-20122 90793-20124 90793-20150 90793-2B124 99000-69835-CR8 999-06910-X9-023 4189.
Item Type Name	Iridium Ix Spark Plug
Item Weight	1.12 ounces
Manufacturer	NGK
Manufacturer Part Number	CR8EIX
Manufacturer Warranty Description	Manufacturer Warranty
Model Number	CR8EIX 4218
Number of Items	4
OEM Equivalent Part Number	297 921
Thread Size	8mm
Top Material Type	Metal
Unit Count	4 Count

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