The first 4-stroke to ever win a supercross race in the premier 250cc division was a YZ400F ... Will the XEMX Yamaha XE4 ...

True to its lineage (and its name), the bike continues to be powered by the 250cc liquid-cooled four-stroke engine ... meant to ride in the dirt we're talking about, Yamaha also tampered with ...

That may come as a surprise to some, if only because Yamaha didn't actually make its first proper dirt bike until ... and ...