Who ever owned it before you more than likely took the rev limiter off. Its probably better you get use to it because the limiter sucks when its on. Thats probably the first thing everybody does when they buy a new raptor is take the rev limiter off.
Ya, I have the limiter on mine and its horrible. Like if I get stuck and need some power to back out then forget it. It goes like 8-10 mph and doesnt rev very high so be happy your limiter is off and kinda get used to it cause its much better then the ladder... Believe me.