Positioned in Kawasaki's cross - motocross motorcycle lineup, the 2025 Kawasaki Kx450Sr utilizes a 449 cc engine layout. Internal engine geometry specifies a bore and stroke of 96.0 x 62.1mm with a 12.5:1 compression ratio.
On the scales, the Kx450Sr measures 238.2 kg (525 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 37 mm (1.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 58 mm (2.3 in) wheelbase engineered for quick, flickable steering geometry. The 1.64-liter (0.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 2 indexed model years from 2025 to 2026, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
IgnitionDigital CDI with handlebar-controlled power modes
LubricationForced lubrication, semi-dry sump
Transmission
Gearbox5-speed, return shift, with wet multi-disc manual clutch and hydraulic clutch actuation
Final DriveChain
ClutchWet multi-disc, manual
Chassis
Frame TypeAluminum perimeter
Front Suspension49mm Showa inverted telescopic coil-spring fork with 21-way adjustable compression and 22-way adjustable rebound damping/12.0 in
Rear SuspensionUni-Trak® gas charged shock with piggyback reservoir with adjustable dual-range compression damping (19-way low speed and 4.25 turn stepless high speed), 23-way adjustable rebound damping and stepless adjustable preload/
Wheelbase58.5 in
Ground Clearance13.4 in
Wheels & Brakes
Front Tyre80/100-21
Rear Tyre120/80-19
Front BrakesSingle semi-floating 270mm Braking/Sunstar petal disc with Brembo master cylinder and dual-piston caliper
Rear BrakesSingle 240mm Braking/Sunstar 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.
