$200 NL: Turn Check or Bet?

[Sciolist]

Villain is 18/14 with a racist name and a very straightforward play style. Not that it's strictly relevant in this hand, whenever he has top pair he donks into pfr, for example.

Party Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 6 Players - (LegoPoker HH Converter)

<font color="black">Hero (SB): $313</font>
BB: $116.64
UTG: $192.85
MP: $211.45
CO: $208.75
BTN: $344.28

<font color="black">Preflop:</font> Hero is dealt K[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, <font color="red">CO raises to $4</font>, BTN folds, Hero calls $3, BB folds

<font color="black">Flop:</font> ($10) J[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $8</font>, <font color="red">Hero raises to $27</font>, CO calls $19

<font color="black">Turn:</font> ($64) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $40</font>

Fold preflop perhaps?
Do I obligate myself to bet the turn when I flop check/raise?