32 REFERENCES BOOKS William F. Smith and Javad Hashemi. Foundations of Materials Science and Engineering fourth edition. Mc Graw Hill WEB SITES Malcolm J. Beare http://en.wikipedia.org/wiki/Six_stroke_engine Beare Head http://en.wikipedia.org/wiki/Beare_Head Modenas Kriss 110cc http://en.wikipedia.org/wiki/Modenas Four-stroke engine http://en.wikipedia.org/wiki/4_stroke Two-stroke http://en.wikipedia.org/wiki/2_stroke Six-stroke http://en.wikipedia.org/wiki/Six_stroke_engine Two-stroke system operation http://science.howstuffworks.com/two-stroke2.htm