The Dodge Tomahawk is a concept motorcycle produced by Dodge, and it was unveiled in 2003. It features a 10-cylinder, 8.3-liter (505 cubic inches) engine derived from the Dodge Viper sports car, and it claimed a top speed of around 350 mph (560 km/h).
Please keep in mind that there might have been new developments and releases since my last update, so it's a good idea to check for the most recent information to find out if any new motorcycles have surpassed the Dodge Tomahawk in terms of top speed.