I just bought a supposedly new JD Z655 and it came with a 27 hp engine. It appears to have a lower cc rating than the Kawasaki 24 hp engine that I thought I was getting. Did I buy 2015 model which I thought I was paying for or did I get an older model? The salesman found it at another dealership so that I could get it earlier than ordering from the factory. I am a little disappointed because I did not end up with the Kawasaki. Should I be?