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Kawasaki's 450cc four-stroke motocross bikes and their cross-country versions, across the KX450F, KX450 and SR names.
2022 – 2026 · 449cc · 4-stroke
Claimed '2024–'. There was no 2024 KX450SR; it returned for 2025 on the 2024 KX450 platform (new engine, frame, Showa suspension). 2026 exists; 2027 not found.
Launched on the 2019-platform KX450 with a polished-port cylinder head, Pro Circuit titanium exhaust, revised fuel injection and KYB suspension.
2006 – present · 449cc · 4-stroke
The F suffix returns on an electric-start bike with a new frame and swingarm (longer wheelbase), revised intake and exhaust, and Brembo brakes front and rear.
2021 – present · 449cc · 4-stroke
Renamed from KX450X on the new-frame 2027 KX450F, with a larger translucent tank for the first time.
All-new frame and engine layout with a center-port exhaust, Brembo front brake, and handlebar map and traction control switches with the Rideology app.
All-new bike with electric start and no kick starter; the F was dropped from the name.
Redesign with engine, chassis and throttle-body changes.
New frame, significant engine changes and launch control.
Second generation, with fuel injection from 2009.
First KX450F; the planned 2005 debut slipped to 2006 after a frame failure, and 2007 replaced the 4-speed gearbox with a 5-speed.
Moved to the all-new 2024 KX450 platform with off-road settings and Dunlop AT81 tires.
Introduced on the 2019-platform KX450 with off-road tuning and equipment.