Your very likely to get a bite out of your back side!
One major hicup that can happen is that EPA / Customs will seize it during inspections.
2 reasons:
It's illegal, and has been for many a year, to import a Kubota that was not intended for market to the US.
It's illegal to import any engine to the us that does not meet current EPA emissions standards.
And of course a seller will tell you it's all fine and there will be no problem!