How can I make the tao rhino 250cc faster?

[Mountain man]

I'm gonna buy 2 rhino 250s and use for trail riding and a lot of hunting looking for best ways to make it faster or some type of good mods that will help anyway? I ask only because I never get a straight answer about there top speed some saw 45 some say 30 if anyone know id appreciate your input on this. I guess there is a governor on it or something?