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The Kawasaki Ninja H2 is a "supercharged supersport" class motorcycle in the Ninja sportbike series, manufactured by Kawasaki Heavy Industries, featuring a variable-speed centrifugal-type supercharger.The H2R with 310 horsepower (230 kW) and 326 horsepower (243 kW) with ram air, is the most powerful production motorcycle on the market. The H2R track-only variant has 50% more power than the fastest street-legal motorcycles, and would exceed the production motorcycle top speed of nearly 200 miles per hour (320 km/h) held by the Suzuki Hayabusa or Ninja ZX-12R, but the comparable street-legal H2 has a much lower power output of 200 hp (150 kW)210 hp (160 kW)with ram air.
Its namesake is the 750 cc Kawasaki H2 Mach IV, an inline triple that was introduced by Kawasaki in 1972 to "disrupt what it saw as a sleeping motorcycle market".