If you were able to actually remove fuel from the bottom of the cases then there is far more in there. Pull the carbs and reeds then let it sit over night and/or use some air to disapate any additional fuel that is in the bottom end. From there reinstall the carbs, be sure the proper bowl is on the proper carb, the proper slide is in the proper carb, choke tube on, etc, etc... Will filters off and choke off use a bit of starting fluid and give it a kick.
Also, what jetting and needle position is your current setup?