86s low pair, flush draw, .25/.50 NL

[srm80]

Full Tilt, 9 handed, .25/.50NL
I have 55 and have been at the table for 20 minutes, villian has around 140 and I have no real reads on him yet other than that he has almost 3 buy ins. button has 40, no real reads.
hero is in LP with 8 [img]/images/graemlins/spade.gif[/img],6 [img]/images/graemlins/spade.gif[/img]

fold around to hero who raises to $1.50, button calls $1.50, fold to villian in BB who raises to $4.00, hero and button both call.

(pot $12)

flop: 9 [img]/images/graemlins/spade.gif[/img],K [img]/images/graemlins/spade.gif[/img],6 [img]/images/graemlins/diamond.gif[/img]

BB leads for $4, hero raises to 15, button folds, BB move all in, hero?

i had about 40 left, there was 60 in the pot..call or fold? The BBs lead bet on the flop looked weak, which is the reason I raised, when he moved all in I had another decision to make.