Couple things come to mind:
1) you could have an air leak in your intake system - some spray carb cleaner around the reeds/intake boot while running and listen for RPM change, others pull it off the machine and inspect for holes/tears (hold it up to bright light)
2) your float level may be incorrect (did you accidently bend anything while cleaning the carb?)
3) you didn't clean it as well as you thought and there's still some clogged holes in that idle jet (I've invested in a ultrasonic cleaner for this very reason)
4) inspect your reed pedals for cracks & chips...
hope this helps...