At the heart of the 2019 Kawasaki KX450 cross - motocross motorcycle, Kawasaki pairs a 449 cc (27.4 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 96.0 x 62.0 mm (3.8 x 2.4 inches) with a 12.5:1 compression ratio.
On the scales, the KX450 measures 110 kg (243 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 955 mm (37.6 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,485 mm (58.5 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
955 mm (37.6 in)
Engine
Displacement449.0 ccm (27.40 cubic inches)
Engine TypeSingle cylinder, four-stroke
Compression12.5:1
Bore x Stroke96.0 x 62.0 mm (3.8 x 2.4 inches)
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multi-disc, manual
Chassis
Frame TypePerimeter, aluminium
Wheelbase1485 mm (58.5 inches)
Ground Clearance340 mm (13.4 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 Ø250 mm (9.8 inches)
Dimensions & Weight
Weight incl.110.0 kg (242.5 pounds)
Seat Height955 mm (37.6 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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
