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Yamaha's big-bore four-stroke motocross and cross-country racers, from the 1998 YZ400F to today's YZ450F and YZ450FX.
1998 – present · 449cc · 4-stroke
New frame, bodywork, standard Nissin hydraulic clutch and new KYB shock on the 2023 engine.
2016 – present · 449cc · 4-stroke
Redesign with a new YZ450F-derived frame, hydraulic clutch and retuned KYB suspension.
All-new dry-sump engine and new frame, with revised electronics and slimmer bodywork.
Electric start replaced the kickstarter, with a new engine, frame and Power Tuner app.
All-new chassis and engine keeping the rearward cylinder, with the air intake moved to the front of the bike.
All-new fuel-injected, rearward-slanted four-valve engine in a new bilateral-beam aluminum frame.
New aluminum frame and 5-speed gearbox, with over 300 parts changed.
449cc five-valve carbureted engine in a redesigned steel frame; 4-speed gearbox in 2003–2004, 5-speed from 2005.
Added: 426cc. Wikipedia's infobox says 2000–2003, its section heading 2000–2002; 2003 was the YZ450F.
Added: 399cc five-valve, the first modern production four-stroke motocrosser.
All-new model on the 2023 YZ450F dry-sump engine and frame.
Moved to the 2018-type YZ450F engine and bilateral-beam frame, shared with the 2019 WR450F.
Launched on the reverse-cylinder YZ450F engine with off-road gearing and suspension.