I am beginning to think that I purchased an $8000 lemon....My model is the 2001, before they changed the heights to 1/2" increments, it is a 25 hp Kohler, Air Cooled and it CUTS HORRIBLE. Unless your cutting low at 2" it leaves tons of stringers and uncut grass. I replaced blades, checked tire pressures, Pitch of the mower, cleaned under deck. It just doesn't want to lift the grass to cut it...I use aftermarket 21" lesco blades. What is the problem with this thing....25 HP should be sucking worms out of the ground, I had to do a double take on a lawn today to make sure I had the blades on!! I have to double cut EVERY LAWN!!! THIS SUCKS!