Steal attempt, river 2 pair vs. turn raise

[Aukai]

Who else raises this river? New to the table, no read or pt stats on bb.

Party Poker 3/6 Hold'em (9 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is MP3 with 2/images/graemlins/club.gif, A/images/graemlins/club.gif.
UTG folds, UTG+1 folds, MP1 folds, MP2 folds, <font color="CC3333">Hero raises</font>, CO folds, Button folds, SB folds, BB calls.

Flop: (4.33 SB) 8/images/graemlins/diamond.gif, A/images/graemlins/spade.gif, 4/images/graemlins/club.gif <font color="blue">(2 players)</font>
BB checks, <font color="CC3333">Hero bets</font>, BB calls.

Turn: (3.16 BB) 7/images/graemlins/spade.gif <font color="blue">(2 players)</font>
BB checks, <font color="CC3333">Hero bets</font>, <font color="CC3333">BB raises</font>, Hero calls.

I put bb on one of 3 hands here- 87, 74, or A4. I almost ditch it here. Without any further read, assuming he's your average 3/6 player, I don't see him raising a flush draw.

River: (7.16 BB) 2/images/graemlins/spade.gif <font color="blue">(2 players)</font>
<font color="CC3333">BB bets</font>, <font color="CC3333">Hero raises</font>, BB calls.

If my turn read was right, I'm ahead 2/3s of the time and behind 1/3. Comments?

Final Pot: 11.16 BB

[MoreWineII]

Reads would help, obviously. Is your opponent capable of semi-bluffing the turn with something like K8?

Anyway, you're new to the table and vs. an unknown, I feel like you should call down, even unimproved. I just think most PP players are willing and able to semi-bluff HU in a spot like this.

I'm a calling station. /images/graemlins/frown.gif

[Grease]

Given his turn check raise, I'd probably just call him down here. I probably would fold the turn, but I think raising here might be a little too aggressive.