I have seen other people do this and I highly recommend NOT doing this (on a 2 stroke). The crank case needs lubrication inside it and by running it out of fuel you are basically running the motor dry of lubrication which is not good on the internal parts. It is much easier and cheaper to buy a carb kit or clean a carb than to rebuild your motor from the inside out. Also when you go to fire up the engine again after draining the carb, how many times do you think that your motor turns over without proper lube in it before she fires up? Not good IMO