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63-1123
 
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The K&N 63-1123 AirCharger air intake system replaces the restrictive factory air filter and air intake housing in some Yamaha YFZ450 models. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine’s RPM range. The 63-1123 air intake comes with a black rubber topped K&N high-flow air filter and a heat shield that installs into the previous air box space. Air is directed through an aerodynamically engineered intake tube into the engine’s throttle body for a guaranteed power gain. The heat shield accommodates a replacement silicone crank case vent hose and supplied CCV filter. The oversized cone shaped air filter comes with a water repellent DryCharger filter wrap to protect the filter from moisture. This air intake is relatively easy to install usually in 90 minutes or less using existing factory mounting points. The tools needed are a screwdriver, ratchet set and some wrenches. This air intake cannot be sold in California. It is not legal for use in California or other states adopting California emission standards.

More Info on K&N Air Intakes for Sport ATVs
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Free-flowing high density polyethylene tube
  • Easy to install, usually in 90 minutes or less
  • Replaces entire factory air intake system
  • Not legal for highway use in states adopting California emission regulations
  • Washable and reusable air filter

Product Specifications

Estimated Horsepower Gain4.2 HP @ 7200 RPM
Air Filter ColorRed
Air Filter Height5.5 in (140 mm)
Air Filter Large End Diameter6 in (152 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included3
Couplers Included1
Intake Pipe Color / FinishBlack
Intake Pipe PortsAll intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter IncludedMass Air Flow Sensor Adapter Included When Required
Product Box Height8.5 in (216 mm)
Product Box Length18.25 in (464 mm)
Product Box Width14.5 in (368 mm)
Product Style63 Series Aircharger Kits
Replacement FilterRU-4960XD
Street Legal In All US States No
TUV Approved (Europe)No
Vacuum Tubing IncludedYes
Weight6.2 lb (2.8 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.


Customer Feedback


The KN-204 was the perfect fit for my new Yamaha 2015 FZ-07 750cc. I really like the convenience and high-quality metal of the bolt-head, and the excellent seal of the filter. Thank you so much for anticipating the market!
Anne Lane, Stone Mountain, Georgia
I used the K&N RC-2540 filter as an air filter for my Yamaha Towny scooter. It fits perfect and the chrome end dressed up the bike.
Jay Kreminski, Illinois
I have a fz6r Yamaha and my bike drives so much better because of the new filter. A must buy if you have this bike.
Brandon Smith, Las Vegas, Nevada