You're calling to chop at best, so 3/1 doesn't mean much. There's no way he called flop without a pair or trips and 3-pair isn't betting the river often at all.
I can imagine river having a counterfit pair that was too scared to bet the turn, and is now trying to bluff river sincr we checked twice. Im definitely calling river here.
I think pre is much better as a 3bet against the blind open raise and callers.
Pot size is wrong on flop if there was a total of 6 in. I'm assuming you mean UTG raised, 3 callers and then you called for 5 to flop. Preflop is thin with a terrible hand OOP, but your getting monstrous pot odds. Even if there are only 4 in already your getting 9-1 on a call, I'm seeing the flop for those kind of odds. Depending on table squeezing here might be an option, but your hand is terrible and your OOP so I don't like it in general.
On this flop I would mix between check/call and lead. Your hand looks very strong either way, leading or calling with that many villains on a paired board looks very KX. Flop bet isn't big enough, with that many villains go $20 if pot is $30. You don't want to encourage villains with an under pair to stick around and boat up on you.
On turn I agree that his check doesn't say much about his range. Your hand is pretty transparent after flop lead and turn check. You are slow playing an ace or pot controlling a king or giving up a bluff. Betting an ace folds out worse and gets called by chops. A villain without an ace has to put more aces in your range and has little reason to bluff yet, while one with an ace wants to keep you in to get some value on river.
On river this depends on villain, against a bluffy one I might call here 100% of the time, against a nit I fold all the time. With most this is a toss up. I would call here some of the time and fold some of the time. How often depends on how much villain likes to take stabs at pots.
Is this a straddle (meaning that UTG actually has the option of raising when it comes around to him)?
Preflop is kinda meh. On the plus side, we're getting an awesome price to see a flop. But on the meh side, we're going to be OOP with a pretty sucky hand. I don't think folding here is horrible, but that admittedly might be fairly nitty.
One of the rules I have in limped pots is not to go broke. One of the easiest ways to go broke is flopping trips with the worse kicker and having bets go in on every street postflop. I'm pretty cool with this flop checking thru and eliminating a betting round, so I'd probably check/call the flop (especially OOP where we don't have the benefit of seeing what others do plus won't be able to pot control on later streets / facing a raise sucks).
I think I'm pretty much done with the hand on this turn card, unless MP is a notorious bluffer.
Even though we've shown weakness on the last two streets, I'm pretty cool with how we played turn/river against a non-bluffer.
uhh guys, are we seriously talking about folding a suited King from the Big blind for a blind min-raise in a 6-way pot?
I'm never ever folding. I think it's a good spot for a squeeze to $45-50 or so actually depending on stack sizes and Hero's image, but I'm at least calling every time.