I could be wrong here, so someone do please correct me if I am, but I would say its all to do with gear ratio/ sprockets etc, imagine if that bike is a motorcross like a YZ 125 for example, the accelleration is gonna be quick isnt it?
erm. well it may be possible, but motocross bikes are geared down arent they? and if this bike is geared it wouldnt go off the clocks like this!! 140kph is like bit more than 85, hed need a fat hill to accelerate that quickly even after 70 lol
i dunno actually.. watched it a few times 0-60 is in about 7ish seconds .. i think thats possible on a dt but about 25 seconds, he either hits a big hill or has sped up the video and then he accelerates to about 90 and theres people on here with dts that fast .. ask sims he says his dt goes towards 90 mph