The Dodge Tomahawk is powered by a Viper V10 engine and has achieved a claimed top speed of around 350 mph (560 km/h). It is not a mass-produced motorcycle available for sale to the general public.
For mass-produced motorcycles, the title of the fastest production motorcycle is typically associated with the "superbike" category. At that time, one of the top contenders was the Kawasaki Ninja H2R, a track-only motorcycle built by Kawasaki. The Ninja H2R features a supercharged 998 cc inline-four engine and is capable of reaching speeds over 249 mph (400 km/h).
It's worth mentioning that the landscape of high-performance motorcycles is constantly evolving, and new models are released regularly. Manufacturers continually push the boundaries of speed and performance, so it's advisable to check updated information from reliable sources or consult motorcycle enthusiasts or experts to get the most current information on the fastest production motorcycles available.