For a drill ,I've always found the cheap 2 stroke generators work well ,I think around here people throw them out as they are a little hard to start cold but I just remove 2 screws for the air cleaner cover and spray some fuel into the carby and it fires up straight away .It's probably more to do with the fuel evaporating after a while but it leaves the oil in the tank and the fuel mix has a lot of oil in it when you add fuel to the tank making starting harder.
