I have a friend with two Bush Hog ZTR's. One is a 73" with a 27 Kohler and the controls are fast and responsive. He liked it so well be bought a second one, a 61" with the 27 Kohler. To his surprise the second one (61") seems to be very slow and sluggish compared to the first one. He commented that it felt like it had play in the linkage (everything was tightened at the dealer) but everything checked out fine at the dealer. They have tightened the hydraulic belt played with the valves and the dealer says that's just the way it is. So my friend isn't very happy with the performance of the second unit. He talks as though it is night and day getting off the first unit and getting on the second unit. Of course I'm relaying this information second hand so I just thought there maybe someone that had some idea's why the two machines preformed so differently? I don't have the model #'s or any other info at this time but I will try to get it.