When it comes to KX motorcycles, winning runs in the family. The all-new 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.

Power Ahead

The same championship-proven engine performance found in KX motocross bikes is what propels the all-new KX450X motorcycle. This fuel-injected 449cc 4-stroke engine delivers the type of hard-hitting power and a flat torque curve that encourages quick acceleration. Engine maps are optimized for cross-country racing, delivering the ideal amount of useable power. Electric start makes starting the engine as easy as a push of a button. A coned disc-spring hydraulic clutch offers a direct feel, light lever action, and consistent performance.

Gain Full Control

Light and nimble handling is achieved thanks to the lean, lightweight chassis of the legendary KX450 motocross bike. A well-balanced aluminum perimeter frame helps keep the overall weight down and allows for slim ergonomics. The high-performance, race-ready suspension has been optimized for cross-country racing, especially on aggressive trails. Large-diameter brakes deliver strong stopping power, offering a high level of control.

Take on Tough Trails

The KX450X motorcycle is built to meet the tough demands of cross-country racing. Cross-country wheels (F21”/R18”) are paired with specific Dunlop Geomax AT81 tires developed for GNCC racing. A factory-style skid plate and a convenient side stand both come as standard equipment.

Get The Perfect Fit

Slim ergonomics stem from a narrow frame and minimalist bodywork. To help facilitate the perfect fit, the KX450X motorcycle features ERGO-FIT adjustability. Four handlebar positions and two footpeg positions allow you to tailor the KX450X to your body size, riding style and preference.


  • Engine

    4-stroke Single

  • Displacement

    449 cm3

  • Bore x Stroke

    96.0 × 62.1 mm

  • Compression Ratio


  • Valve System

    DOHC, 4 valve

  • Fuel System

    Fuel injection (o44 × 1)

  • Ignition


  • 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

    49 mm inverted telescopic fork with adjustable compression and rebound damping

  • Rear Suspension

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

  • Front Wheel Travel


  • Rear Wheel Travel


  • Rake


  • Trail


  • Steering Angle (L/R)

    42? / 42?

  • Front Tyre

    80/100-21 51M

  • Rear Tyre

    120/90-18 65M

  • Front Brake/s

    Single semi-floating o270 mm petal disc

  • Front Caliper/s


  • Rear Brake

    240 mm petal disc

  • Rear Caliper



  • Dimensions (LxWxH)

    2185 × 820 × 1265

  • Overall Length


  • Overall Width


  • Overall Height


  • Wheelbase


  • Road Clearance


  • Seat Height


  • Curb Mass

    111.6 kg

  • Fuel Capacity


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