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                                MODEL SPECS | 
                            
449cc fuel-injected four-stroke
                                            engine
                                        49mm Showa coil-spring
                                            front fork
                                        Click on a technology to learn more.
| Engine Management Technology | 
| Chassis Management Technology | 
| Engine | 4-stroke single, DOHC, liquid-cooled | 
| Displacement | 449cc | 
| Bore x Stroke | 96.0 x 62.1mm | 
| Compression Ratio | 12.5:1 | 
| Fuel System | DFI® with 44mm Keihin throttle body | 
| Ignition | Digital CDI with electric start | 
| Transmission | 5-speed, return shift, with wet multi-disc manual clutch and hydraulic clutch actuation | 
| Final Drive | Chain | 
| Front Suspension / Wheel Travel | 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping/12.0 in | 
| Rear Suspension / Wheel Travel | Uni-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/12.1 in | 
| Front Tire | 80/100-21 | 
| Rear Tire | 120/80-19 | 
| Front Brakes | Single semi-floating 270mm Braking® petal disc with dual-piston caliper | 
| Rear Brakes | Single 250mm Braking® petal disc with single-piston caliper | 
| Frame Type | Aluminum perimeter | 
| Rake/Trail | 27.6°/4.8 in | 
| Overall Length | 86.0 in | 
| Overall Width | 32.7 in | 
| Overall Height | 50.2 in | 
| Ground Clearance | 13.4 in | 
| Seat Height | 37.6 in | 
| Curb Weight | 232.3 lb without fuel / 242.4 lb* | 
| Fuel Capacity | 1.64 gal | 
| Wheelbase | 58.5 in | 
| Color Choices | Lime Green | 
| Warranty | Not Available | 
*Curb weight includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied).
KAWASAKI CARES: Read Owner’s Manual and all on-product warnings. Always wear a helmet, eye protection and proper apparel. Never ride under the influence of drugs or alcohol. Adhere to the maintenance schedule in your Owner’s Manual. ©2025 Kawasaki Motors Corp., U.S.A.
Specifications subject to change.
                                GALLERY | 
                            
                                        2019 KX™450: "Next Level" Ad (full)
                                    
                                        2019 KX™450 Tech: Holeshot
                                    
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                                        2019 KX™450: Press Launch
                                    
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                                        Science of Supercross Engineered by Kawasaki – Episode 68 (Advanced Brain Function)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 67 (Altitude)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 66 (Hand Sanitizer)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 65 (Helmet Technology)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 64 (Supercross Suspension)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 63 (Mechanic’s Area)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 62 (Engine Oil)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 61 (Practice)
                                    
                                        Science of Supercross Engineered by Kawasaki - Episode 60 (Exhaust)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 59 (3D Printing)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 58 (Heart Rate)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 56 (New Team Transporter)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 55 (Pressure and Sacrifice)
                                    
                                        Science of Supercross Engineered by Kawasaki – Episode 54 (Handlebar Engineering)
                                    
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