http://www.bring-knowledge-to-the-world.com This animation will explain the inner workings and basic principle of two-cycle engines (also known as two-stroke engines).
Contents 1) Difference to four-stroke engines 2) Two-stroke engine with carburetor 3) Deflector piston, intake port and exhaust port 4) Transfer port of two-stroke engines 5) Explaining different strokes 6) Intake, compress, combust 7) Expand, refill, exhaust 8) Crossflow scavenging 9) Uniflow scavenging in opposed piston engines 10) Modern engines with loop scavenging