top set vs unknowen villian

[sc000t]

For all those that have missed it. He has top set and a flush draw, not just a naked set. Hes 40/60 against the nut hand on the turn ATxx, this is a standard hand.

[Tartufo]

Would you rather lead the turn on the offbeat chance that he's folding the 2nd straight?

[illdonk]

I like the flop lead there, shorthanded with the top set. Now, how much do you have to have left to consider folding the river?