Add Power to 2004-2009 Yamaha YFZ450 ATV with K&N Air Intake Kit

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K&N has developed a new performance air intake kit, part number 63-1123 for 2004-2009 Yamaha YFZ450 Sport ATV owners. See the complete list of models below.

K&N's 63-1123 air intake system for the Yamaha YFZ450 ATV
K&N's 63-1123 air intake system for the Yamaha YFZ450 ATV

K&N's 63-1123 installed on a 2008 Yamaha YFZ450 with an optional blue K&N DryCharger wrap
K&N's 63-1123 installed on a 2008 Yamaha YFZ450 with an optional blue K&N DryCharger wrap
K&N dynamometer testing shows a 4.27 horsepower gain at 7200 RPM. This is well over a 10% power gain for power you can feel. K&N’s air intake design has lower restriction than the factory system. Once installed, you will notice the benefits of a less restrictive system.
2008 Yamaha YFZ450
2008 Yamaha YFZ450


Dyno chart for 2008 Yamaha YFZ450
Dyno chart for 2008 Yamaha YFZ450

The 63-1123 air intake system replaces the stock airbox and intake track with a complete rotomolded intake tube, a powder coated aluminum airbox and an oversized K&N high-flow air filter part number RU-4960XD. The K&N air filter is washable and reusable and provides excellent filtration. It is also pre-oiled and ready for installation.

The powder coated black heat shield assembly helps prevent rust and corrosion and isolates the K&N air filter from the engine compartment. This way the K&N air filter receives a consistent flow of fresh air.

There is also a K&N supplied remote mounted crankcase breather which helps keep the air filter cleaner and helps to dissipate the extra heat and oils which generate from crankcase pressure. Installation can be performed in 90 minutes or less. Take a look at our 63-1123 installation video to see all the steps involved.

A black K&N DryCharger filter wrap part number RX-4990DK, is also included for increased protection and longer service intervals in extreme dust or wet conditions. Jetting modifications will be necessary to obtain maximum performance. The 63-1123 is covered by the K&N Limited Warranty for one year.

Models for air intake part number 63-1123 are:

2009 YAMAHA YFZ450
2008 YAMAHA YFZ450
2008 YAMAHA YFZ450
2007 YAMAHA YFZ450 SE
2007 YAMAHA YFZ450
2006 YAMAHA YFZ450
2005 YAMAHA YFZ450
2004 YAMAHA YFZ450

Find K&N products for your vehicle using the K&N application search then use the K&N dealer search to find a K&N dealer in your part of the world.



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K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports from off-road and powersports to drag racing, stock cars and road racing. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail tech@knfilters.com, or visit www.knfilters.com.

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