You probably have the engine washed down with all that gas . Maybe now the plugs are wet. I'd pull the plugs , dry them, if your sure your get spark , mix up some motor oil with some gas 70%gas, 30% oil and dump some in the carb . spin it over with the plugs out . Install the plugs and see if it will start. I wouldn't mess with anything else yet. Just confirm that you have spark while it is cranking .