Today I contacted hustler and talked to jack in the tech dept. He confirmed that a casting flaw in some of the 7000 series will cause an issue with crankcase pressure, which in turn causes an issue with the fuel pump which runs off crankcase pressure. This issue is random and doesn't affect all 7000 series motors. Motor will run till warmup about 20 minutes then stall out. If your going to buy a mower with a 7000 series I suggest having the salesperson run the mower for 20 minutes or so to make sure your not getting a bad motor. I appreciate everyone's input.