Analysis of information sources in references of the Wikipedia article "Yamaha DT" in English language version.
Yamaha's first no-compromize [sic] off-road model.
The DT1 was a superb motorcycle right off the drawing board, as its two-stroke, piston-port single with five ports provided the good lowend grunt that play-bikers wanted.
The world's first true off-road motorcycle debuted in 1968 to create an entirely new genre we know today as trail bikes.