If you notice once h2 reach 330km/hr he let go the throttle can eventually it can catch and pass him thats the reality. Fireblade has an insane top end power. There a few vids here on youtube that gapping h2 in a straight away.
Never kid! I can easily say that the h2 was stock. Because of the downhill the acceleration of bike added to the acceleration of downhill. A ecu flashed or unrestricted Kawasaki h2 can easily touch 340kmph in a straight road.But in this case the top speed of the stock h2 300kmph added with the downhill acceleration +40kmph. The h2 is stock hence it is restricted till 300kmph that's why a modded honda was little bit more accelerating. If you check the top speed of honda in a straight line without ups and down, it will never go beyond 320kmph.