According to the search results, the top speed of the Kawasaki Ninja H2R is around 240 mph or 400 km/h. In fact, the Kawasaki Ninja H2R holds the record for the fastest production motorcycle ever built by any manufacturer. In 2016, a world record was set by Kenan Sofuoglu, who reached 400 km/h in just 26 seconds while riding the Kawasaki Ninja H2R. It is important to note that the Kawasaki Ninja H2R is a track-only motorcycle and is not street legal due to its high speed and power output.