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Yamaha's full-size two-stroke motocross and cross-country bikes, 125 to 490cc.
1974 – present · 125cc · 2-stroke
First full model change in over 15 years: all-new engine, chassis and bodywork.
2020 – present · 125cc · 2-stroke
1974 – present · 249cc · 2-stroke
New YZ-F style bodywork and four-stroke fork tubes on the aluminum chassis.
2016 – present · 249cc · 2-stroke
YZ250-based cross-country model with lower compression, new head and power-valve ramp, wide-ratio 5-speed.
1982 – 1993 · 490cc · 2-stroke
One generation until research dates a platform change.
All-new aluminum frame and swingarm.
Liquid-cooled engine in a steel frame.
Original air-cooled YZ125.
Launched on the aluminum-frame YZ125 with cross-country ignition, power valve and suspension settings.
All-new aluminum frame and swingarm.
Current 66.4×72mm engine introduced in 1999; current frame geometry and bodywork from 2002.
Added to close the 1974–1998 hole; internal boundaries (air to liquid cooling 1982 per Wikipedia) not split for lack of a second source.