is the quad stock or are you talking about the quad in your sig. b/c for a 440 kit the jetting sounds pretty lean to me. what size pilot you running. that might be lean also.
my motor is pretty much stock except for what's in my sig and i'm on a 40 pilot and a 165DJ main.
04' 400EX
White Bros. E2
FMF Hi Flo Headers
DynoJet Kit
K&N Filter
Hot Cams Stage1
EHS Racing Air Box Lid
DG Fat Series Nerfs
Pro Armor Swing Arm Skid Plate
Pro Taper Bars
Maxxis Razr's on Douglas Wheels
Pro Armor Foot Peg Maxi-Mizers
ASV C5 Pro Clutch Lever
LSR P-Brake block off
Modified stock carburetor
Sparks +6 key