A throttle governor, also known as a speed limiter, is a device that restricts the maximum speed of a vehicle.
Motorcycles like the Kawasaki Ninja 250 are typically designed and manufactured for general road use and are not typically equipped with speed limiters or throttle governors. The speed of the motorcycle is primarily controlled by the rider's throttle input.
These devices can be installed aftermarket or be available as add-on features provided by the manufacturer or authorized dealerships.
For the most accurate and up-to-date information about specific models and their features, it's recommended to consult the manufacturer's official documentation or contact a Kawasaki dealership.