How fast is the top speed of a 2013 Honda trx250x ATV?

This vehicle will go 45 to 49 mph maximum in its original condition. If you want to increase the speed, change the sprocket ratio. Get a smaller rear sprocket, minus four teeth, and a bigger front sprocket of plus two teeth, then get a larger carburetor and you will gain perhaps five to ten miles per hour. But be careful when ridin in rough terrain at high speed.