So I traded up to a 540 yesterday. I really needed the power steering due to my chronic shoulder problems. The steering killed me on my 500. I noticed when I got it home that it really didn't have any throttle between idle and WOT. Meaning if I moved the throttle lever back and forth, it seemed it would just jump to one or the other. I also noticed when idling down it would fall on its face. Sometimes it would recover but other times it died. It really bothered me since my 500 was baby smooth. Engaging the PTO would also bring it to its knees and it too would kill the engine at times. I took it back to the dealer and a service guy informed me that Kawasaki has the new liquid cooled engines leaned out to the max to pass emissions. I also was told this was the last year that Kawasaki was making a vertical shaft liquid cooled because of emissions standards. We tested out a few other 540's and they were better than mine but still not like my 500. If they don't have a solution tomorrow I am really thinking about going back to a 530. I only got the 540 because with the rebate it was only $300 more. I guess what I am getting at is, has anyone else experienced this and has it gotten better with use? They told me it will probably get better but probably wont cut it when it doesn't and I cant return it. I am also concerned about it running that lean, I know that can cause issues as well. I only put 50 or so hours a year on one so the liquid cooled is not necessary, I just liked the tilt steering and seat.