What are the advantages of a two-stroke engine?

1. Two stroke engines do not have valves, which greatly simplifies their structure and reduces their own weight.
2. Two stroke engines are ignited once per revolution, while four stroke engines are ignited once every other revolution. This gives the two-stroke engine an important power foundation.
3. The two-stroke engine can run in any direction, which is important in certain equipment such as chain saws. A standard four stroke engine may malfunction when the fuel shakes, unless it is standing upright. Solving this problem will greatly increase the flexibility of the engine.
These advantages make two-stroke engines lighter, simpler, and cheaper to manufacture. A two-stroke engine also has the potential to double the power into the same space, as it has double the power stroke per revolution. The combination of lightweight and double power gives it an astonishing "thrust to weight ratio" compared to many four stroke engines.