[Lurker4]

Without reads I think I at least call the turn getting 8-1, due to you possibly having 3-9 outs to win, nearly always 4 to tie, and the small possibility being ahead to a bluff/semibluff that will give up on the turn once you call, thinking you will likely showdown. A2-A5 plays this way as as much as 22/44 since your line looks like a strong ace, and there are 18 combos of the two-pair aces against which you have on average 8 outs against, and only 6 combos of the hands you are only drawing to a split against.