AK against big stack

Villian had been pretty loose, and i did not put him on a good hand starting. His bet dosent really tell me alot, but i took it as weakness. Should i be making this play?

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) converter

CO (t1310)
Button (t805)
SB (t2580)
BB (t520)
UTG (t1170)
Hero (t1615)

Preflop: Hero is MP with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t250</font>, <font color="#666666">2 folds</font>, SB calls t200, <font color="#666666">1 fold</font>.

Flop: (t600) K[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB bets t150 <font color="#CC3333">Hero goes all-in</font>, SB calls t1215.

Final Pot: t1965