Your 216 needs gas, compression, and spark to run. Gas, check for too little, or too much. Spark is easy, pull a wire and turn 'er over, see if it sparks. Compression, well, it started once, must have enough. Same for timing. My guess is the fuel line plugged, or the needle valve or float are dirty. Try priming it with a dribble of gas down the carb throat. Good idea to have a good fire extinguisher handy when firing up an engine that you don't know.