I bought mine new in January of this year. When it was delivered the idle was running quite a bit higher than it should have been - so much so that I had difficulty driving it at all. I called the dealer and they checked with Kubota for the correct idle speed. Mine was 200 rpm higher. They said to bring it back in and they would reset it, but the next time I drove it the idle had returned to "normal". I have no idea why this occurred and it hasn't reoccurred, so I'm just chalking it up to "break-in"...