*grunch*

you do not really want to find a A[img]/images/graemlins/club.gif[/img] or 6[img]/images/graemlins/club.gif[/img] on the turn, so you are protecting very few outs, actually. Probably no more than 3 or 3.5. When CO really raises so few hands, you are only ahead of AK at the moment. Check/call is not an option with these few outs. So I agree with the bet, hope he raises. If there is a reraise I would get away from the hand immediately.
I wouldn't do the same trick on the turn though but check/fold UI. Especially when you have cold-callers. You might be reverse dominated yourself if you hit an A then.