At the heart of the 2026 Kawasaki Kx450X cross - motocross motorcycle, Kawasaki features a 449 cc engine configuration. Internal engine geometry specifies a bore and stroke of 96.0 x 62.1 mm with a 12.5:1 compression ratio.
On the scales, the Kx450X measures 113.4 kg (250 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 950 mm (37.4 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1 mm (0 in) wheelbase engineered for quick, flickable steering geometry. The 6.2-liter (1.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 6 indexed model years from 2021 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
950 mm (37.4 in)
Engine
Displacement449 cc
Engine Details449cc, liquid-cooled, 4-stroke, DOHC 4-valve single
Compression12.5:1
Bore x Stroke96.0 x 62.1 mm
Fuel SystemFuel injection: ø44 mm x 1
IgnitionDigital DC-CDI
LubricationForced lubrication, semi-dry sump
Transmission
Gearbox5-speed, return
Final DriveChain
ClutchWet multi-disc, manual
Chassis
Frame TypePerimeter, aluminum
Front Suspensionø49 mm inverted fork with adjustable compression and rebound damping / 305 mm (12.0 in)
Rear SuspensionNew Uni Trak with adjustable dual-range (high/low-speed) compression damping, adjustable rebound damping and adjustable spring preload / 307 mm (12.1 in)
Wheelbase1,480 mm (58.3 in)
Wheels & Brakes
Front Tyre80/100-21 51M
Rear Tyre120/90-18 65M
Front BrakesSemi-floating ø270 mm petal disc with dual-piston caliper
Rear Brakesø240 mm petal disc with single-piston caliper
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
