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2021 Kawasaki KX 450X — photo 1 of 15
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Specs

New or used
Used
Availability
In stock
Colour
Lime Green
Displacement
449 ccManufacturer spec
Engine cycle
Four-strokeManufacturer specDealer: 4-stroke single, DOHC
Cooling
Liquid-cooledManufacturer specDealer: Liquid
Transmission
ManualManufacturer spec
Final drive
ChainManufacturer spec
Seat height
37.4 inManufacturer spec
Wheelbase
58.5 inManufacturer spec
Ground clearance
13.2 inManufacturer spec
Wet weight
235.8 lbManufacturer specDealer: Curb without fuel- 235.8 lb. Curb - 246 lb.** (Curb weight includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied))
Fuel capacity
1.64 galManufacturer spec
Model code
KX450KMFNN
Stock #
N/A
All details from the dealer (22)
Stock Number
N/A
Model Type
Off-road

General Information

Stock Number
N/AManufacturer spec

Brakes/Wheels/Tires

Brakes
Front - Single semi-floating 270 mm Braking® petal disc with dual-piston caliper Rear - Single 250 mm Braking® petal disc with single-piston caliperManufacturer spec
Tires
Front - 80 / 100-21 Rear - 120 / 80-18Manufacturer spec

Dimensions

Length
Overall - 86 in.Manufacturer spec
Height
Overall - 49.8 in.Manufacturer spec
Width
Overall - 32.3 in.Manufacturer spec

Engine

Bore x Stroke
96 x 62.1 mmManufacturer spec
Compression Ratio
12.5:1Manufacturer spec
Clutch
Coned disc-spring hydraulicManufacturer spec
Fuel System
DFI® with 44 mm Keihin throttle bodyManufacturer spec
Ignition
Digital CDIManufacturer spec
Starting
ElectricManufacturer spec
Modes
Launch ControlManufacturer spec

Operational

Frame
Aluminum perimeterManufacturer spec
Front Suspension
49 mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping Travel - 12 in.Manufacturer spec
Rear Suspension
Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed / 19-way low-speed) compression damping, 22-way rebound damping and adjustable preload Travel - 12.1 in.Manufacturer spec
Rake
27.6°Manufacturer spec
Trail
4.7 in.Manufacturer spec
Handlebars
Renthal® Fatbar®Manufacturer spec

Other

Includes
Easy engine tuning Finger-follower valve actuation Slim, ergonomic bodyworkManufacturer spec

From the dealer's page

When it comes to KX™ motorcycles, winning runs in the family. The all-new KX™450X motorcycle is powered by technology that hails from a legacy of champions and tuned to take on the toughest terrain. Get the off-road edge on the bike built to ride ahead of the rest.

Price history

Tracked since Oct 2, 2026 · last checked 2h ago

Price details as printed by the dealer

  1. Price$5,990

Throttle does not add these up.

Timeline

  1. First seen

    Oct 2, 2026

Market context

Comp set: 2019–2023 Kawasaki KX 450X · 2 listings

Fewer than three comparable units are indexed, so there is no honest median to compare against yet. We would rather show nothing than a number we cannot stand behind.