Question: how to tell the difference between 2 stroke and unleaded?
Answer: Look at the fuel cap. For a two-cycle engine, if it is the original fuel cap it will likely have a fuel and oil mix ratio ( 32:1 , 40:1 etc.) or gas can and oil can symbols on it. Look for stickers labeling the equipment (e.g., "Four Cycle" or "No Fuel Mixing"). Look for an engine oil fill cap.