The top speed of a 1000cc motorcycle can vary depending on several factors, including the specific make and model, aerodynamics, weight, engine tuning, and gearing. In general, most modern sport motorcycles with a 1000cc engine are capable of reaching top speeds in the range of 160 to 186 miles per hour (260 to 300 kilometers per hour).
It's important to note that reaching these top speeds on public roads is not legal or safe. Speed limits and traffic conditions must always be obeyed to ensure your safety and the safety of others. High speeds should only be attempted on closed tracks or controlled environments where it is legal and safe to do so, with proper safety gear and precautions in place.