50NL river play with set

[Tib]

Vilain is 40/15/1.7
I checked the turn to induce a bluff on the river.. There we go, vilain bet 6$, and now raise ? if yes, how much ?

Party Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $22.37
BB: $44.36
UTG: $49.62
Hero (CO): $85.22
BTN: $77.31

Preflop: Hero is dealt K[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG folds, <font color="red">Hero raises to $2.00</font>, 2 folds, BB calls $1.50

Flop: ($4.25) 5[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $3.00</font>, BB calls $3.00

Turn: ($10.25) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, Hero checks

River: ($10.25) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">BB bets $6.00</font>