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Kawasaki's 250cc four-stroke motocross bikes and their cross-country versions, sold as KX250F and, from 2019 to 2026, KX250.
2004 – present · 249cc · 4-stroke
The F returns on the 2025 platform with a reshaped combustion chamber, longer exhaust and a larger hydraulic clutch.
2021 – present · 249cc · 4-stroke
Renamed from KX250X with the 2027 KX250F engine updates.
All-new: center-port exhaust head, cylinder tilted 5°, new frame based on the 2024 KX450, Showa suspension replacing KYB.
New: KX450-derived frame, electric start (no kickstart), hydraulic clutch. KYB suspension through 2024.
New: 78.0 x 52.2 mm bore/stroke, finger-follower valvetrain, stiffer frame ('much stiffer than in 2019'). Still kick start.
New split: same bike as 2018, only the F dropped. Split from 2017–2018 only because the badge changed; an editor may instead fold it into 2017–2018 if a generation can carry two badges.
New engine and chassis update ahead of the 2019 rename.
Fuel injection and Showa SFF fork from 2011, a second injector in 2012 and new bodywork in 2013.
Engine overhaul for power and weight, suspension and chassis changes.
Kawasaki-developed generation with a new aluminum perimeter frame and heavily revised engine.
First KX250F, co-developed with Suzuki and sold as the Suzuki RM-Z250 too.
Moved to the all-new 2025 KX250 with a center-port exhaust, traction control and app tuning.
Introduced on the all-new electric-start 2021 KX250 with off-road tuning and equipment.