KK with str8t board on turn do you call?

[JC_Saves]

I was thinking that I could be beat by a set or the str8t but I dind't think that someone would call my raise with JT. I couldn't see being behind to two pair here, and I actually thought that maybe a set would reraise on the flop bet.

What would you do on all streets?

PokerStars No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

MP2 (t1327)
MP3 (t1780)
<font color="#C00000">CO (t1862)</font>
Button (t1370)
SB (t1656)
BB (t1280)
<font color="#C00000">Hero (t1470)</font>
UTG+1 (t1040)
MP1 (t1715)

Preflop: Hero is UTG with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t90</font>, <font color="#666666">4 folds</font>, CO calls t90, <font color="#666666">1 fold</font>, SB calls t75, <font color="#666666">1 fold</font>.

Flop: (t300) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets t200</font>, CO calls t200, SB folds.

Turn: (t700) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t420</font>, <font color="#CC3333">CO raises to t1572</font>, Hero ?