The Yamakasi is the fastest vehicle in the game with a speed of 250. It can be unlocked at level 37.
The Yamakasi is indeed the fastest vehicle, but in return, it has difficult handling and only 600 units of vehicle health. As the name suggests, it is based on a Kawasaki Ninja ZX-6R with some influences of the Ducati 804.
Like all motorcycles, it is able to perform wheelies and stoppies by the player tilting his or her device. When bumping into a breakable object (eg: a telephone pole) it likely will soar up in the air.