Well just did some serious mowing the other day, a 3/4 acre field that was overgrown about 12 inches or so. I would go over it with the deck up, and then back over it at 3.75" to get it short. By the way I have a Exmark 21Kawi Lazer HP bought in March. Yesterday mowing along and the engine just stopped, almost like I had hit something. Checked the blades and belts, everything looked fine. I could spin the mule drive with my hand so nothing was affecting (effecting?) that. When you try and start it the fan tries to move but clicks. Sounds like something is stopping it from turning over... Had to push the thing on the trailer, which was a blast by the way, and took it to my dealer this morning. Good news #1: Service guys dont work on Saturdays Good News #2: They are getting audited on Monday so they can give out no loaners until then Good News #3: after throwing my mule drive pulley two days ago and taking it in, I am behind on 12 accounts that are really large, with a full schedule next week. The guy at the desk said it sounded like a busted engine, but the mower only has 65 hours on it so far!! The mower was not straining in any way going through the grass so I did not think that would be a problem..... I will say I havent checked the oil in about 20 hours though so I was wondering if that might be a problem? But it just came out of the shop yesterday!!! ANy suggestions or situations like this?