The Hammer

Hi, I'm a new owner of a 2004 V Star 650. The bike has about 150 miles on it and i have noticed that at 55 mph no matter how much throttle i give it it just won't go any faster. I have tried this in 4th and 5th gear and it is exactly the same. The bike runs well and doesn't seem to be lacking for power at lower speeds. Is there some sort of factory speed limiter or something that could be causing this? Thanks in advance for the info.