Just got off the phone with the dealership. They said they might swap out the tractor but then they found a service bulletin. They have to add a shim under the fuel injectors. This is how kubota adjust the fuel on these tractors. They ordered part and said it would be in on Tuesday and they will pick up the tractor and fix it. I don't like messing with a new factory put together tractor and I don't have great confidence in their service department. Anyway they at least recognized that the tractor bellowing smoke for 6 minutes is a problem. I will let you know how I make out.
Man I think this tractor was built on Friday. Low on UDT and fuel problems.