clean carb well soak it if possible and blow out arfices with compressed air, depending on the year of ur machine your carb may be adjustable or not
if so adjust your low speed (idle control) first start 1 turn out and adjust till smooth, then adjust high speed start at 1.5 turns out
lift rpm up while adjusting, also check your intake bolts for tightness
there also two holes on the main jet screw one you will see no problem the other is very small (sits in the top grove) make sure these hole are clear