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Kawasaki KX450F

Kawasaki KX450F Top Speed, Specs, Review & Price in 2024

The Kawasaki KX450F is the top-of-the-line motocross motorcycle offered by the brand. It features a liquid-cooled four-stroke engine that offers hard-hitting power. It gets a 5-speed transmission with a durable chain drive. This motocrosser comes with factory-inspired styling that looks quite aggressive and sporty. The chassis components of the KX450F have been redesigned to reduce its curb weight significantly.

Kawasaki KX450F Top Speed, Specifications, Price, & Review

Key Specifications

Engine 1-Cylinder, 4-stroke
Transmission 5-Speed
Power51.8 hp @ 8,900 rpm
Seat Height950 mm
Curb Weight108.8 kg
Fuel Tank Capacity6.3 liters

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Top Features

  • Perimeter frame made of aluminum
  • Redesigned chassis components
  • Factory-inspired graphics and design
  • Slim radiator shrouds
  • 49 mm Separate function front forks with triple air chambers
  • Titanium coating on front forks
  • Fully adjustable Uni-Trak rear suspension with spring preload
  • Petal front disc brake with semi-floating dual caliper
  • Petal rear disc brake with single-piston caliper
  • Four-position adjustable handlebar
  • Adjustable footpeg position
  • Liquid-cooled, four-stroke engine
  • Battery-less fuel injection system
  • Lightweight ECU with three engine maps
  • Launch control system
  • KX FI calibration controller kit
  • 5-Speed transmission
  • Semi-dry sump with forced lubrication system

Kawasaki KX450F Review

Beginning with the frame, the flagship motocross is built on the same perimeter frame as the smaller KLX 140R. Instead of high tensile steel, the Kawasaki KX450F chassis is made of aluminum which helps it achieve light body weight. Its sleek body design bodes well with its slimmer and lightweight frame. It comes fitted with 49 mm inverted separate function forks with a triple air chamber. The rear end of this motocrosser is equipped with a fully adjustable Uni-Trak shock absorber with a spring preload. Kawasaki KX450F offers a front and rear wheel travel of 305 mm. It gets a 270 mm petal disc brake with a 2-piston caliper on the front wheel and a 240 mm petal disc brake with a 1-piston caliper on the rear wheel.

It is equipped with a 449cc single-cylinder engine with double overhead camshafts. The Kawasaki KX450F gets a battery-less fuel injection system and liquid cooling system. It comes with a DC-CDI ignition system which is also seen on the Kawasaki KLX 110R. This motocrosser churns out 51.8 hp of maximum power and 32.9 lb-ft of maximum torque. The Kawasaki KX450F top speed is nearly 90 mph but it may vary depending on the rider’s weight & riding conditions. It comes paired with a 6-speed transmission and it gets a wet multi-plate clutch. This motocrosser has a curb weight of only 108.8 kg which makes it very agile. KX450F seat height is 950 mm and its ground clearance is 335 mm.


The 450cc motocross segment is quite competitive as each popular brand has a model on sale in this segment. The Kawasaki KX450F competitors are Husqvarna FC 450, KTM 450 SX-F, Honda CRF450R, Suzuki RM-Z450, and Yamaha YZ450F. Among the 450cc motocrosser, the Husqvarna FC 450 comes out at the top in terms of power and torque output followed by the Honda CRF450R.

Kawasaki KX450F Price and Variants

Kawasaki has replaced this motocrosser with the all-new KX450. During its production years, the KX450F was available in only one variant. The last recorded price of the Kawasaki KX450F is $8,849.

Related Bikes

Honda CRF450RHonda CRF450R
Kawasaki KX85Kawasaki KX85

Kawasaki KX450F Specifications

Engine & Transmission

Engine Type1-Cylinder, 4-stroke, DOHC
Engine Displacement449cc
No. of Cylinders1
Fuel TypePetrol
Fuel SupplyFuel injection
Cooling SystemLiquid cooling
Bore 96 mm
Stroke26.1 mm
Compression Ratio12.8:1
Valves Per Cylinder4
Starting Primary kick
Ignition Digital DC-CDI
Transmission 5-Speed
ClutchWet, multi-disc, manual
Final DriveChain

Top Speed Performance, & Mileage

Power 51.8 hp @ 9,300 rpm
Torque32.9 lb-ft @ 7,800 rpm
Top SpeedKawasaki KX450F top speed is 90 mph
Mileage25-30 mpg
0-60 mph14-15 seconds

Chassis & Suspension

Body TypeMotocross
ChassisAluminum perimeter frame
Front Suspension49 mm Inverted separate function forks
Rear Suspension Uni-Trak shock absorber with spring preload
Front Wheel Travel305 mm
Rear Wheel Travel305 mm

Brakes, Wheels, & Tires

Front BrakePetal disc with semi-floating 2-piston caliper
Rear BrakePetal disc with single-piston caliper
Front Brake Diameter270 mm
Rear Brake Diameter240 mm
Front Wheel21 Inch, spoked rims
Rear Wheel19 Inch, spoked rims
Tire TypeTubed
Front Tire Size80/100-21 51M
Rear Tire Size120/80-19 63M

Dimension & Capacity

Wheelbase 1,495 mm
Length 2,195 mm
Width820 mm
Height1,280 mm
Seat Height 950 mm
Ground Clearance335 mm
Curb Weight 108.8 kg
Fuel Tank Capacity6.3 liters
Seating Capacity1

Electricals & Lighting

Battery TypeNo battery
Battery Capacity0
Pilot LightsNo
Taillights No
Turn Signals No
Pass LightNo

Instrument Console & Speedometer

Console TypeNo instrument console
Trip MeterNo
No. of Trip MetersNo
Fuel GaugeNo
Gear Shift LightNo
Gear Position Indicator No
Low Fuel Indicator No
Engine Temperature IndicatorNo
Service Indicator No

Other Features

Electric StarterNo
Engine kill SwitchNo
Stand Alarm No
Stepped SeatNo
Pillion SeatNo
Pillion GrabrailsNo
Pillion Footrest No
Underseat StorageNo
Additional FeaturesAdjustable motocross ECU, Rear intake ducts

Conclusion On the Kawasaki KX450F

The KX450F is a first-class motocrosser that promises championship-winning performance and handling. Its single-cylinder powertrain uses a unique battery-less FI system that offers uninterrupted power delivery. The DOHC engine gets some minor updates and it is very reliable. The high-end suspension setup along with a lightweight and compact chassis brings out razor-sharp handling. The Kawasaki KX450F is one of the finest motocrossers that offers amazing power and control.

Frequently Asked Questions

How much horsepower does the Kawasaki KX450F produce?

The single-cylinder engine of the KX450F is capable of producing 51.8 hp @ 9,300 rpm.

What is the ground clearance of the Kawasaki KX450?

It has a ground clearance of 335 mm.

What is the weight of the KX450F?

This motocrosser has a curb weight of 108.8 kilograms.

Dos the Kawasaki KX450F comes with disc brakes?

Yes, it is equipped with petal-type disc brakes on the front and rear wheels.

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