Rivered top pair, value raise time? NL100

[BluEsiNsOuL]

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

SB: $89.50
Hero (BB): $100.90
UTG: $49.65
CO: $71.90
BTN: $53.80

Pre-Flop: T[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
UTG folds, CO calls $1, BTN calls $1, SB folds, Hero checks

Flop: ($3.50) 6[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/heart.gif[/img] (3 Players)
Hero checks, <font color="red">CO bets $1</font>, BTN folds, <font color="red">Hero raises to $4</font>, CO calls $3

I really hate donk bet so I raise it up. Lots of times I can win the hand right there. I assume it is not a leak?



Turn: ($11.50) 5[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, CO checks

Seems he called me, I assume he actually hit some piece of the board. I don't think I can push him off by betting again. So I checked and plan to give up the hand if not improved.

River: ($11.50) T[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $3</font>, <font color="red">Hero raises to $8 ???</font>

Now it becomes interesting. I rivered a top pair with weaker kicker. I don't think the T will help him unless he played very very weird. And his bet size is small. So I raise it up, is it good?