If it's been sitting for a few months, before you threw in sone fresh fuel did you drain the carbs? I can think you might of had oil/fuel seperation in the bowls.The oil will make the float valve act strange which could lead to your drip.
Check to see if you're carbs are out of synch.Whenever the slides are pulled out for any reason they must be synched.Everything on both carbs must be the same as far as needles,mains,pilots and airscrews.