The Kawasaki Ninja H2R is a track-only motorcycle designed for extreme performance. It features a supercharged engine and aerodynamic design, specifically built for speed. The top speed of the Kawasaki Ninja H2R is reported to be around 249 mph (400 km/h). It's important to note that the Ninja H2R is not street legal and is intended for closed-course racing or track use only.
It's worth mentioning that there are other contenders for the title of the fastest production motorcycle, such as the Ducati Panigale V4 R, Suzuki Hayabusa, or various models from other manufacturers. However, specific top speeds and rankings may vary depending on factors such as engine power, aerodynamics, and technological advancements.
For the most up-to-date and accurate information on the fastest motorcycles, I recommend referring to reputable sources and staying updated on the latest releases and records in the motorcycle industry.