Too passive with AK unimproved?

[RikaKazak]

No read on villian cause he only had 15 hand in PT, he's done nothing special, but does seem to be a little loose pf, I have a tight image, but aggressive and good defense of sb vs. bb.

My question is on the turn, after looking back, I think that's it's a mandatory bet by hero. I think a nice pot size bet takes this down a lot, and if called usually vs. 1 pair and have tons of outs. And if villian ck raises, well....heads up, reevaluate, I don't think I run into set/2 pair that often though. I could be wrong. Appreciate your guys thoughts. Thanks in advance.

Party Poker No-Limit Hold'em, $ Hero (6 max, 6 handed) FTR converter on zerodivide.cx

Hero ($1000)
UTG ($1694)
MP ($2680.47)
CO ($980)
Button ($190.75)
SB ($809.50)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $5.
<font color="#666666">4 folds</font>, SB (poster) completes, <font color="#CC3333">Hero raises to $30</font>, SB calls $30.

Flop: ($80) 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $55</font>, SB calls $55.

Turn: ($190) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero ?????

results in white:

<font color="white"> Hero checked behind on turn, river 2, villian checks hero checks villian shows 4,6o for pair of 4's and wins pot </font>