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63-1123
$306.99 USD
MSRP $555.99 44.8% Off
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K&N 63-1123 Air Intake

Performance Products > Performance Intake Kit
  • 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
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

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 MaterialHigh-Density Polyethylene
Product Box Height8.5 in (216 mm)
Product Box Length18.25 in (464 mm)
Product Box Width14.5 in (368 mm)
Product StyleMotorcycle Intake System
Replacement FilterRU-4960XD
Street Legal In All US States No
TUV Approved (Europe)No
Weight6.2 lb (2.8 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

Customer Feedback

Be the first to review part 63-1123
Installed a K&N air filter in our 2002 Toyota Avalon and got better idle quality, better acceleration and better performance in general. In 1971 I installed a K&N filter on my Yamaha motocross bike and saw an impressive gain in performance... needless to say, I've used them since that day.

Earl Parker II
Shelby, North Carolina
Item arrived 2 days after payment. Perfect replacement for my 2010 Yamaha xj6n after fitting an after market exhaust. It is like a fresh breath mint for my motorcycle, helps it breathe more easily.

John Ramsbottom
Gwynedd, United Kingdom
Excellent product, fast shipping, excellent fitment on my 2005 Yamaha, Roadstar Warrior. Bike has excellent take off from the line and all threw the gears.

Tony Thomas
Rchfield, Utah