The choke is stuck, probably from having bad gas in the carb for too long. Probably the easiest way to unstick it is to go buy some Shell Premium fuel. Empty out all the old gas, especially the fuel hose, that you can and then put about a quart of new fuel in the tank. Pour a spoonful in the carb. Try and start. Another spoonful, try and start. Just keep repeating this until you get some indication of the engine trying to fire. Of course the carb is flooded so you will have to wait on intervals. Eventually, the engine will fire and run on the spoonful of gas. Keep going and eventually the fuel from the tank will make it to the carb, and the engine will run. The idea is to get the good Shell premium fuel to unstick everything in the carb. It will do it. You will need to change the oil because gas may have worked itself completely through the engine into the crankcase.