If it's revving all the way up, there isn't any electronic speed limiter. Usually with Kymco CDIs you have to cut into the plastic at a certain spot to deregulate them, if they are regulated. Unless you know specifically that the exact model of quad you own does have an electronic speed limiter and how to eliminate it, it isn't a good idea to start cutting wires or the cdi. It usually doesn't end well or cheap.