The Kawasaki KX450 is Kawasaki's 450 four-stroke motocross bike, renamed from the KX450F in 2019. It uses a liquid-cooled 449cc single with electric start in a light aluminium frame.
Later models offer smartphone connectivity through Kawasaki's Rideology app. Rivals include the Honda CRF450R, Yamaha YZ450F and KTM 450 SX-F.
| Year | Photo | Engine | Power | Weight | Seat | Fields |
|---|---|---|---|---|---|---|
| 2027 |  |
449 cc | – | – | 960 mm | 31 |
| 2026 |  |
449 cc | 56 hp | 107 kg | 960 mm | 42 |
| 2025 |  |
449 cc | 56 hp | 107 kg | 960 mm | 44 |
| 2024 |  |
449 cc | 56 hp | 107 kg | 950 mm | 44 |
| 2023 | |
449 cc | 56 hp | 106 kg | 955 mm | 43 |
| 2022 |  |
449 cc | 56 hp | 106 kg | 955 mm | 43 |
| 2021 |  |
449 cc | 56 hp | 106 kg | 955 mm | 43 |
| 2020 |  |
449 cc | 56 hp | 105 kg | 955 mm | 43 |
| 2019 |  |
449 cc | 56 hp | 105 kg | 955 mm | 43 |