The top speed of a 1000cc motorcycle can vary depending on various factors such as its design, aerodynamics, weight, and engine performance. However, many modern 1000cc motorcycles are capable of reaching speeds of over 180 mph (290 km/h). Some high-performance sportbikes specifically designed for track use may even have top speeds exceeding 200 mph (320 km/h). It's important to note that reaching these speeds should only be done in controlled environments, such as closed tracks or racing circuits, and always while adhering to local traffic laws and regulations.