K7s is this too thin?

[orange]

Alright...on PF, I limped because CO is one of the biggest donks Ive seen. I've taken $250 off him in the last 5 minutes and he's a crazy maniac. He's very loose, aggro in some spots and a sick calling station in other spots.

Anyways, main villan is pretty TAGgy, runs like 19/16. He hasn't done a whole lot. I think he is capable of calling this river with worse 7s, sometimes other stuff. I have been pretty loose, only been here for an orbit or two but very loose/in alot of pots due to CO. Me and main villan don't have much history but my image is pretty trashy right now. Do you just check this river?

Poker Stars
No Limit Holdem Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
UTG: $295.25
CO: $411.95
orange: $429.95
SB: $200
BB: $455.95

Pre-flop: (5 players) orange is Button with K[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img]
UTG calls, CO calls, orange calls, SB calls, BB checks.

Flop: 3[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] ($10, 5 players)
<font color="#cc0000">SB bets $8.05</font>, 3 folds, orange calls.

Turn: T[img]/images/graemlins/club.gif[/img] ($26.1, 2 players)
SB checks, <font color="#cc0000">orange bets $15</font>, SB calls.

River: 8[img]/images/graemlins/heart.gif[/img] ($56.1, 2 players)
SB checks, <font color="#cc0000">orange bets $25</font>