If the intake valve happened to be open at the time the water may have entered the cylinder. I would change the oil just in case it did. You don't give the engine model number so I don't know what type of carb your talking about. If the carb has a float bowl, it should be removed and cleaned out. If it's a tank mounted suction type carb it won't have a float bowl. I would also drain and clean the fuel tank.
Rick
November 2005