Built around Kawasaki's cross - motocross motorcycle platform, the 2021 Kawasaki KX250X features a 249 cc (15.2 cu in) liquid-cooled single cylinder, four-stroke configuration. Internal engine geometry specifies a bore and stroke of 78.0 x 52.2 mm (3.1 x 2.1 inches) with a 14.1:1 compression ratio.
On the scales, the KX250X measures 104.4 kg (230 lbs) dry. Rider ergonomics and chassis geometry center around a 945 mm (37.2 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,486 mm (58.5 in) wheelbase engineered for balanced agility and highway composure. The 6.21-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
945 mm (37.2 in)
Engine
Displacement249.0 ccm (15.19 cubic inches)
Engine TypeSingle cylinder, four-stroke
Compression14.1:1
Bore x Stroke78.0 x 52.2 mm (3.1 x 2.1 inches)
Fuel SystemInjection. DFI® with 44mm Keihin throttle body and dual injectors
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital CDI
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet multi-disc, manual
Chassis
Frame TypeAluminum perimeter
Rake27.8°
Trail130 mm (5.1 inches)
Front Suspension48mm inverted telescopic coil spring fork with 23-way compression damping and 20-way rebound damping
Front Travel315 mm (12.4 inches)
Rear SuspensionUni-Trak® with dual-range (2.25 turns high speed/21-way low-speed) compression damping, 38-way rebound damping and adjustable preload
Rear Travel315 mm (12.4 inches)
Wheelbase1486 mm (58.5 inches)
Ground Clearance330 mm (13.0 inches)
Wheels & Brakes
Front Tyre80/100-21
Rear Tyre100/90-19
Front BrakesSingle disc. Petal disc with dual-piston caliper
Front Brake Ø270 mm (10.6 inches)
Rear BrakesSingle disc. Petal disc with single-piston caliper
Rear Brake Ø240 mm (9.4 inches)
Dimensions & Weight
Dry Weight104.4 kg (230.2 pounds)
Seat Height945 mm (37.2 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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
