Anywhere between 100mph - 110mph. My 2004 red lines at approx 105mph and start on fire at 106mph. If you want to go fast, you would have never bought a ninja 250 anyway.
As fast as your grandma moves on the bed.
The kawasaki bayou 250 goes exactly 39MPH. I know from experience as I had a person with a speedometer ride next to me
My kx85 goes around 70-75 mph.