The 2-stroke engine

Some useful reading here:

http://www.southernskies.net/page_info/runningtwostrokeengine.html

http://www.theultralightplace.com/2%20stroke%20principle.htm

http://science.howstuffworks.com/transport/engines-equipment/two-stroke2.htm

http://en.wikipedia.org/wiki/Two-stroke_engine