2018 Kawasaki KX 450F



The KX™450F motorcycle is the most powerful, lightweight, and agile KX450F ever. Developed from the highest levels of racing, this championship bike has advanced technology sourced straight from the world’s premier race team—another reason why the KX450F is The Bike That Builds Champions.


  • CHAMPIONSHIP-PROVEN POWER: The KX™450F motorcycle is lightweight and powerful due to innovative race-proven components. Pick a category to start exploring.
  • ENGINE: Race-team-inspired bridged-box bottom piston is lightweight and designed to match intake valves to optimize combustion efficiency for maximum performance at all rpms. The powerful and lightweight engine delivers instant throttle response, broad power delivery and incredible peak power.
  • EXHAUST: Exhaust header features an integrated resonator for crisp throttle response at low rpm and reduced exhaust sound level.
  • INTAKES: Rear seat intakes ensure clean airflow and contribute to improved throttle response

Frame and Styling

  • SLIM, LIGHTWEIGHT CHASSIS: Lightweight aluminum perimeter frame for sharp handling. Triple clamp offers optimal stability on corner entry to allow quick turn-in. Slim frame spars and narrow shrouds allow easy rider movement. Optimized swingarm rigidity for maximum rear wheel traction.
  • AGGRESSIVE BODYWORK: Lightweight bodywork features in-mold graphics for a durable, aggressive look. Lightweight bodywork with smooth, seamless surface at the rider's contact points.
  • ERGO-FIT™ ADJUSTABILITY: The adjustable handlebar mounts provide a choice of 4-positions (35 mm range of adjustment) enabling the rider to set-up their ideal riding position. Factory-style Renthal handlebar and handlebar pad come standard.
  • ERGO-FIT™ FOOTPEGS: Two-position adjustable footpegs help reduce knee angle when seated. Footpegs allow the rider to adjust center of gravity by 5 mm.

Fuel Mapping

  • ADVANCED FUEL MAPPING TECHNOLOGY: The KX™450F motorcycle features several advanced ignition and fuel-mapping systems for precise adjustability.
  • DFI® COUPLERS: Factory-tuned power settings with plug-and-play versatility. Select a coupler to access one of the 3 different pre-set engine maps. Standard, hard and soft terrain setting options.
  • LAUNCH CONTROL MODE: Maximizes traction and acceleration out of the gate. Race-team-derived feature for grabbing the holeshot. Engages with a press of a button. Functions in first and second gears. Precise ignition timing helps ensure quicker acceleration with less slippage.


  • SHOWA SFF-AIR TAC FORK: Lightweight design with tuned rigidity to match chassis dynamics and optimize front end feel. Features low-friction fork seals and optimized valve settings for smoothaction and progressive damping.

General Information

Manufacturer Kawasaki
Model Year 2018
Model KX 450F
Model Code KX450HJF
Color Lime Green



Front - Single semi-floating 270 mm Braking® petal disc with dual-piston caliper

Rear - Single 240 mm Braking® petal disc with single-piston caliper


Front - 80/100-21

Rear - 120/80-19


Length Overall - 86.4 in.
Height Overall - 50.4 in.
Width Overall - 32.3 in.
Weight Curb - 239.8 lb.
Ground Clearance 13.2 in.
Wheelbase 58.9 in.
Seat Height 37.4 in.


Transmission 5-speed, return shift
Final Drive Chain


Engine 4-stroke, 1-cylinder, DOHC
Displacement 449 cc
Bore x Stroke 96 x 62.1 mm
Compression Ratio 12.8:1
Fuel System DFI® with 43 mm Keihin throttle body
Fuel Capacity 1.6 gal.
Ignition Digital DC-CDI
Cooling Water


Frame Aluminum perimeter

Front - Inverted Showa SFF-Air TAC fork with Triple Air Chamber, DLC coated sliders, 22-position compression and 20-position rebound damping adjustment; 12 in. travel

Rear - Uni-Trak® linkage system and Showa shock, 19-position low-speed and 4-turns high-speed compression damping, 22-position rebound damping and fully adjustable spring preload; 12 in. travel

Rake 28.2°
Trail 5 in.


Warranty Not available