Question

why hayabusa is so fast​

Answer 1

Kawasaki ninja is more than Hayabusa

Answer 2

What's special about the Suzuki Hayabusa is that it was the final word in the infamous “speed wars” that raged on for more than a century and really heated up in the 1990s. ... Before all of this went down, the fastest production bike in the world was the 1999 Suzuki Hayabusa with a top speed of 188–194 mph (303–312 km/h).