Kansas Sweet Cherry

The name implies that this is a sweet cherry, but the description describes it as a tart cherry. Would it pollinate a sweet cherry?

Prunus cerasus, the "sour cherry" does not normally cross pollinate reliably with Prunus avium, the "sweet cherry", however Kansas Sweet is a hybrid that will accept either provided bloom times overlap. You will need another late blooming Prunus cerasus, or an early blooming Prunus avium, to pollinate the Kansas Sweet (which itself is a naturally occuring hybrid).

The description says "self fertile", the answer to one question says "for all purposes it is a sweet cherry", and another answer says "You will need something like Montmorency to cross pollinate with it", yet another says "you will need another sweet cherry for cross pollination", and lastly "You will need another Prunus cerasus to pollinate the Kansas Sweet" Can we get some straight answers as to whether this will produce without a pollinizer and if not, what type of cherry is suitable?

Kansas Sweet is an P. avium x P. cerasus hybrid that is partially self fertile. To get full production you will either need a late P. cerasus, like Monmorency, or an early blooming P. avium like Almanden Duke for cross pollination. Not all sour cherries bloom late enough, nor do all sweet cherries bloom early enough. I hope that clears things up for you and we will update the answers to the other questions to be more comprehensive.

Answer to first question says another sour cherry (P. cerasus) is needed for pollination. But the answer to 2nd question says another sweet cherry is needed. Which is it? Would Stella work?

Kansas Sweet is a late blooming sour cherry hybrid that benefits from cross pollination for a better yield. You will need something like Montmorency to cross pollinate with it.

Can this be pollinated by a Nanking cherry?

No, you will need another late blooming sweet cherry, or early blooming sour cherry for cross pollination. That said Kansas Sweet is partially self fertile and does not require another tree to cross pollinate for a moderate yield.

Would this do well on the east coast, like sour cherries, or should I get another of the sweet cherries listed for the east, like black gold

This is a sweet/sour cherry hybrid, but for eating purposes it is a sweet cherry. It will cross polliante with either late blooming sour cherries like Montmorency, or early blooming sweet cherries like Almanden Duke.