$11 Weak TP from BB

do you lead out at the flop? and what do you do after? he wasn't so agg..

Full Tilt Poker, $10 + $1 NL Hold'em Sit n' Go, 40/80 Blinds, 4 Players
LeggoPoker.com - Hand History Converter

UTG: 7,425
BTN: 2,200
SB: 2,725
Hero (BB): 1,150

Pre-Flop: (120) 9:heart: 8:heart: dealt to Hero (BB)
BTN calls 80, SB calls 40, Hero checks

Flop: (240) 5:spade: 4:spade: 9:club: (3 Players)
SB checks, Hero bets 120, BTN raises to 400, Hero??

I would lead a little more on the flop, maybe 140-160. Once you get raised by a passive player, time to GTFO.