(here's that damn spelling again, bear with me lol) i would check your needel and seat the "ones" under the carb floats. with the banshee being high reving and well a 2-stroke at that. if they are the ones that came with the bike i would almost bet that they were wore out. the seat is more often then not made of brass and the needel aluminium(sp?)they wear into eachother from vibration. this will cause the needel to "drop down" in the seat, not allowing the floats to meter the fuel properly, causing it to dump way too much fuel into the cylinders. if you do get new ones i would recamend the ones with the black rubber nippels, they seal and last longer then the others.
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jim
99 banshee
.020 over
vito power dome pistons
Yamaha race division port&polish
FMF gold series fattys(custom) 
boyesen pro series carbonfiber reeds
vito 3 degree keyway
UNI filter, no lid
moose h/bars w/ LSR dog bone
dura blue x
renthal alu. sprockets
(rear) douglas red-tag w/ pure sport bandits
(front) itp with bandits
2001 polaris 800xcr (175hp) 
SLP power dome heads
Boyesen power reeds
RPM port job
240 studs
and a few other tricks!!!
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