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Yamaha's 250cc two-stroke motocross racer, the last Japanese 250 two-stroke still in production. Popular with open-class amateurs and vets who want two-stroke power.
New YZ-F style bodywork and four-stroke fork tubes on the aluminum chassis.
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.
engine_cc computed from the cited bore x stroke.
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