50NL: What do you do with KJ here?

[Shoot59]

It is villain's second hand...complete unknown

Also: Preflop raise standard??

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($40.50)
MP ($48.50)
CO ($72.85)
Button ($39.20)
SB ($49.50)
Hero ($62.05)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, CO calls $0.50, <font color="#666666">1 fold</font>, SB completes, <font color="#CC3333">Hero raises to $2.5</font>, CO folds, SB calls $2.

Flop: ($5.50) 8[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $4</font>, <font color="#CC3333">SB raises to $12</font>, Hero???