Top pair, no kicker in multiway pot

[Raist0000]

Suppose this situation: 1 limper, you limp in the button with K2 (I know it's a bad move, but oh well), SB raises, BB call, limper call, you call. 4 players in.

Flop is K74r. SB bets, what's your plan in the hand if:
1) it's folded to you, you raise and SB 3-bets.
2) there are 1 or 2 callers
3) there are 1 or 2 callers, but the flop is instead K76 with two cards of the same suit
4) it's raised to you
5) it's raised to you, but the flop is instead K76 with two cards of the same suit

Many thanks to all!

[bboy_]

i almost never raise this on the flop, in any of these cases. after SB raised a bunch of limpers OOP and bet the flop into them, he is screaming that he beats K2 so i will play this passively