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 track-only variant is called Ninja H2R and produces maximum of 310 horsepower (230 kW) and 326 horsepower (243 kW) with ram air, is the most powerful and fastest production motorcycle on the market. The H2R has 50% more power than the fastest street-legal motorcycles, while the street-legal Ninja H2 has a 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". In June 2015, TT race competitor James Hillier rode a Kawasaki H2R as an inter-race demonstration lap at on regular Superbike slick race tires around the 37-mile road course, leading to a roads TT record of the highest top speed attained in the Isle of Man by a motorcycle. The top speed of "over 206 mph" (332 km/h) on the Sulby Straight was recorded on Hillier's personal Strava GPS smartphone app for cyclists. On June 30, 2016, Kenan Sofuoglu, the most successful five-time world champion Supersport circuit-racer, made a top speed attempt. Sofuoglu, sponsored by Kawasaki, was supplied with a stock H2R, other than special-formula rubber tires developed by Pirelli for the top speed attempt to withstand extreme high speeds, and the bike was supplied with race-grade fuel. Sofuoglu was supplied with a special one-piece leather suit by Rev'It! to enhance aerodynamics for his record attempt. This attempt endorsed by the Turkish president, was made across the newly completed Osman Gazi Bridge, the fourth longest in the world at just over a mile and a half. Kawasaki quoted that the H2R maximum speed to be 380 kilometres per hour (240 mph). After training and preparing for four months, Sofuoglu went 400 kilometres per hour (250 mph) in just 26 seconds with a video recording the bike's dashboard display. The attempt was not confirmed with any chronometers or GPS or radar, just recorded by the bike's on-board computer, and later with a theoretical calculation, of the distance he traveled in 26 seconds on the 8,799-foot-long (2,682 m) bridge. Cycle World's Kevin Cameron had calculated two years earlier that with the right gearing, the H2R's engine power could theoretically overcome aerodynamic drag up to 250–260 miles per hour (400–420 km/h).
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