river value bet and size ftp 2/4

[nath]

villain is loose and donkish. plays too many hands preflop, takes weird lines and bets too small when he bets (2.5x PF, checkraising a bet of $22 to $54, etc). and he's made a couple marginal / questionable river calls for decent bets.

so how much do i bet? and is there any argument to checking behind?

Full Tilt No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

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

UTG ($380)
<font color="#C00000">Hero ($599.70)</font>
CO ($801.75)
Button ($498.40)
<font color="#C00000">SB ($353.20)</font>
BB ($143.70)

Preflop: Hero is MP with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $14</font>, <font color="#666666">2 folds</font>, SB calls $12, <font color="#666666">1 fold</font>.

Flop: ($32) 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $22</font>, Hero calls $22.

Turn: ($76) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $44</font>, Hero calls $44.

River: ($164) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero...</font>