The top speed of a Kawasaki Ninja 250R can vary depending on factors such as the model year, riding conditions, and rider weight. Generally, the Kawasaki Ninja 250R has a top speed in the range of approximately 95-110 mph (153-177 km/h). However, it's important to note that reaching the top speed on a motorcycle is dependent on various factors, including road conditions, rider skill, and legal speed limits. It's always crucial to ride responsibly and within the legal speed limits in your area.