When it comes to KX motorcycles, winning runs in the family. The cross-country KX450X 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.

Lead the Pack

One of the KX450’s greatest strengths is its engine, and that performance is available on the KX450X. In addition to the hard-hitting fuel-injected 449 cc liquid-cooled, 4-stroke single, the KX450X also shares the electric start, hydraulic clutch and the multi-map programmable race ECU of Kawasaki’s flagship motocrosser.

Serious Power Comes to the Cross-Country Scene

The powerful fuel-injected 449 cc liquid-cooled, 4-stroke single from the KX450 features finger-follower valve actuation (a valve train designed by Kawasaki’s World Superbike engineers) and downdraft-style intake to deliver hard-hitting performance and a flat torque curve that facilitates getting on the gas. Engine maps optimised for the cross-country scene deliver a broad spread of useable power.

Reliable Starting

Being able to restart an engine quickly during a race can mean the difference between keeping your lead, or having to fight your way back through the pack. Electric start makes restarting the engine as easy as pushing a button.

Light & Responsive

Like the KX450, a hydraulic clutch offers direct feel and light lever action. Less play as the clutch heats up during heavy use results in more consistent feeling. The use of coned-disc springs contributes to lighter clutch actuation when the lever has been pulled in, and a wider clutch engagement range, which facilitates control (especially when half-clutching).

Easy Engine Tuning

Lightweight and designed for the rigours of off-road riding, the ECU contains multiple programmable engine maps to offer riders an advantage on the race course. Using the provided DFI couplers, riders are able to easily switch from one to another of the three engine maps to suit riding conditions. The plug-and-play style system is quick, easy and stress-free. Each of the three maps can be reprogrammed using the optional KX FI Calibration Kit.

Light & Nimble

Complementing the powerful engine, the lean chassis from the KX450 offers light, nimble handling. High-grade suspension and brake components, and slim, adjustable ergonomics all add to off-road riding performance.

Lightweight Aluminium Perimeter Frame

The well-balanced frame from the KX450 contributes to the KX450X’s light weight, light handling, and slim ergonomics.

Race-Ready Suspension

High-performance suspension comes directly from the KX450. Spring rates and damping settings optimised for the cross-country scene offer increased feedback, especially when riding on aggressive trails.

Large-Diameter Brakes

The KX450 brake package optimised for cross-country riding includes a large-diameter o270 mm front disc complemented by a o240 mm disc at the rear, KX450-type front master cylinder and KX450X-specific pads, delivering strong stopping power and a high level of control.

Slim, Ergonomic Bodywork

The narrow frame and minimalistic bodywork offer a slim riding position that facilitates control, and a smooth, flat rider interface.

Get the Perfect Fit

A choice of four handlebar positions and two footpeg positions allows riders to tailor their riding position to suit body size and preference. Factory-style o28.6 mm (1-1/8”) Renthal aluminium Fatbar is standard equipment. The thick handlebar helps reduce vibration and shocks transmitted to the rider, and helps put the rider in a position that makes it easier to weight the front wheel.

Optimised Performance

The demands of cross-country courses are vastly different from those of supercross and motocross tracks. Accordingly, in addition to cross-country wheels and tyres, the KX450X’s suspension and brake systems have been optimised for the cross-country scene.

Putting Power to the Ground

While the KX450 features F21”/R19” aluminium rims, the KX450X uses a F21”/R18” combination that facilitates putting power to the ground. Dunlop AT81 enduro-type tyres complement the KX450X-specific wheels and are well-suited to the situations encountered in cross-country riding.

Protection & Convenience

KX factory-style skid plate and a convenient side stand are both standard equipment. The sturdy skid plate helps to protect the underside of the engine, and facilitates sliding over obstacles encountered on the trail, while the side stand comes in handy when stopping away from the paddock area.


  • Engine

    4-stroke Single

  • Displacement

    449 cc

  • Bore x Stroke

    96.0 × 62.1 mm

  • Compression Ratio


  • Valve System

    DOHC, 4 valves

  • Fuel System

    Fuel injection: o44 mm x 1

  • Ignition

    Digital DC-CDI

  • Starting


  • Cooling


  • Lubrication

    Forced lubrication, semi-dry sump

  • Transmission

    5-speed, return

  • Primary Reduction Ratio

    2.727 (60/22)

  • Gear Ratio: 1st

    1.750 (28/16)

  • Gear Ratio: 2nd

    1.412 (24/17)

  • Gear Ratio: 3rd

    1.188 (19/16)

  • Gear Ratio: 4th

    1.000 (19/19)

  • Gear Ratio: 5th

    0.875 (21/24)

  • Final Reduction Ratio

    3.923 (51/13)

  • Clutch

    Wet multi-disc, manual

  • Final Drive



  • Frame

    Perimeter, aluminium

  • Front Suspension

    o49 mm inverted fork with adjustable compression and rebound damping

  • Rear Suspension

    New Uni Trak with adjustable dual-range (high/low-speed) compression damping, adjustable rebound damping and adjustable spring preload

  • Front Wheel Travel

    305 mm

  • Rear Wheel Travel

    307 mm

  • Rake


  • Trail

    120 mm

  • Steering Angle (L/R)

    42? / 42?

  • Front Tyre

    80/100-21 51M

  • Rear Tyre

    120/90-18 65M

  • Front Brake/s

    Semi-floating o270 mm petal disc

  • Front Caliper/s


  • Rear Brake

    o240 mm petal disc

  • Rear Caliper



  • Dimensions (LxWxH)

    2,185 × 820 × 1,265 mm

  • Wheelbase

    1,485 mm

  • Road Clearance

    335 mm

  • Seat Height

    950 mm

  • Curb Mass

    111.6 kg

  • Mass without Fuel

    107.0 kg

  • Fuel Capacity

    6.2 litres

  • Model Code


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