At the heart of the 2025 Kawasaki Kx450 cross - motocross motorcycle, Kawasaki utilizes a 449 cc (27.4 cu in) liquid-cooled single cylinder, four-stroke layout. Internal engine geometry specifies a bore and stroke of 96.0 x 62.1 mm (3.8 x 2.4 inches) with a 12.5:1 compression ratio.
On the scales, the Kx450 measures 112.6 kg (248 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 960 mm (37.8 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,480 mm (58.3 in) wheelbase engineered for balanced agility and highway composure. 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 8 indexed model years from 2019 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
960 mm (37.8 in)
Engine
Displacement449.0 ccm (27.40 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine Details449cc, liquid-cooled, 4-stroke, DOHC 4-valve single
Compression12.5:1
Bore x Stroke96.0 x 62.1 mm (3.8 x 2.4 inches)
Fuel SystemInjection. DFI® with 44mm Keihin throttle body
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital CDI with 3 Coupler Options
LubricationForced lubrication, semi‑dry sump
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multi-disc, manual
Chassis
Frame TypeAluminum perimeter
Rake27.6°
Trail115 mm (4.5 inches)
Front Suspension49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping
Front Travel305 mm (12.0 inches)
Rear SuspensionUni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed/19-way low-speed) compression damping, 38-way rebound damping and adjustable preload
Rear Travel307 mm (12.1 inches)
Wheelbase1480 mm (58.3 inches)
Ground Clearance345 mm (13.6 inches)
Wheels & Brakes
Front Tyre80/100-21
Rear Tyre120/80-19
Front BrakesSingle disc. Semi-floating petal discs
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc. Single-piston caliper.
Rear Brake Ø240 mm (9.4 inches)
WheelsWire spoked
Dimensions & Weight
Weight incl.112.6 kg (248.2 pounds)
Seat Height960 mm (37.8 inches) If adjustable, lowest setting.
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.
