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Yamaha's YZ-based four-stroke enduro bikes, from the WR400F to the current WR250F and WR450F.
2001 – present · 250cc · 4-stroke
New platform: chassis, suspension, bodywork, engine and transmission all revised.
Sweeping engine and frame changes from the 2019 YZ250F, slimmer bodywork; further YZ250F-based updates in 2022.
1998 – present · 449cc · 4-stroke
Added. Transmoto: 'major updates' to engine, frame (new front downtube), KYB shock, new hydraulic clutch, rear brake and bodywork; Yamaha USA marks the 2027 WR450F 'NEW'. The same scale of change as the YZ450FX's 2027 split; the engine is the 2024 one retuned. Editor may treat it as an update instead.
New platform on the fuel-injected, reverse-cylinder YZ250F engine.
All-new aluminum frame replaced the chromoly frame; engine largely unchanged.
Carbureted five-valve engine from the YZ250F in a steel frame; electric start added in 2003.
All-new on the 2023 YZ450F engine with a lower, slimmer chassis.
Full redesign on the 2018-type YZ450F engine and frame; kickstarter removed.
All-new model on the reverse-cylinder YZ450F engine and WR250F chassis.
Fuel injection added and a slimmer aluminum frame from the YZ250F; still forward-cylinder five-valve.
New aluminum frame, dry-sump revisions and revised carb and cam settings.
All-new 449cc five-valve engine with electric start in a steel semi-double-cradle frame.
Added. Wikipedia's infobox says 2001–2003, but its own text and Dirt Action put the WR450F at 2003.
Added from the wr400f merge.