Line Checkup - JJ Against Bad Player on the Turn

[74o_Clownsuit]

Villain is 70/12/2.5 over 294 hands.

I've noticed that Villain tends to leads top pair-like hands then call a raise. He floats/calls cbets with all sorts of trash but he'll def check one street oop with a strong hand in order to slowplay.
Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $168.40
BB: $338.40
UTG: $162.55
CO: $118.70
Clown (BTN): $124.55

Preflop: Clown is dealt J J (5 Players)
2 folds, <font color="red">Clown raises to $3.50</font>, SB folds, BB calls $2.50

Flop: ($7.50) 6[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img] 7 (2 Players)
<font color="red">BB bets $4.00</font>, <font color="red">Clown raises to $18.00</font>, BB calls $14.00

Turn: ($43.50) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
BB checks, Clown???