My friends bone stock S1000 exceeds 186 mph on a race track. MV Agusta too. I am aware of the gentleman's agreement, but it has been ignored in the case of the bikes upon which WSBK is based.From Wikipedia, The Suzuki Hayabusa (or GSX1300R) is a sport bike motorcycle made by Suzuki since 1999. It immediately won acclaim as the world's fastest production motorcycle, with a top speed of 188 to 194 miles per hour (303 to 312 km/h).
Hayabusa (隼?) is Japanese for "peregrine falcon", a bird that often serves as a metaphor for speed due to its vertical hunting dive, or stoop, speed of 180 to 202 miles per hour (290 to 325 km/h), the fastest of any bird. In particular, the choice of name was made because the peregrine falcon preys on blackbirds, which reflected the intent of the original Hayabusa to unseat the Honda CBR1100XX Super Blackbird as the world's fastest production motorcycle. Eventually, the Hayabusa managed to surpass the Super Blackbird by at least a full 10 miles per hour (16 km/h).
In 2000, fears of a European regulatory backlash or import ban led to an informal agreement between the Japanese and European manufacturers to govern the top speed of their motorcycles at an arbitrary limit.
The media-reported value for the speed agreement in miles per hour was consistently 186 mph, while in kilometers per hour it varied from 299 to 303 km/h, which is typical given unit conversion rounding errors. This figure may also be affected by a number of external factors, as can the power and torque values.
The conditions under which this limitation was adopted led to the 1999ÔÇô2000 Hayabusa's title remaining, at least technically, unassailable, since no subsequent model could go faster without being tampered with. Thus, after the much anticipated Kawasaki Ninja ZX-12R of 2000 fell 4 mph (6 km/h) short of claiming the title, the Hayabusa secured its place as the fastest standard production bike of the 20th century. This gives the unrestricted 1999ÔÇô2000 models even more cachet with collectors.
Besides its speed, the Hayabusa has been lauded by many reviewers for its all-around performance, in that it does not drastically compromise other qualities like handling, comfort, reliability, noise, fuel economy or price in pursuit of a single function. Jay Koblenz of Motorcycle Consumer News commented, "If you think the ability of a motorcycle to approach 190 mph or reach the quarter-mile in under 10 seconds is at best frivolous and at worst offensive, this still remains a motorcycle worthy of just consideration. The Hayabusa is Speed in all its glory. But Speed is not all the Hayabusa is."
I don't think anything goes faster than 186 mph in U.S. with a stock ECU. Add a PowerCommander or other such device and yes, you can over-rule the ECU speed limit.