Small Power and Equipment - Notes Two and Four-Stroke Engines – Principles and Operations of Small Engines Engines operate on the principle of a cycle. There are two and four-stroke engines that have very similar cycles and processes. What is an internal combustion engine? What are the 4 parts of the engine block that are required for the engine to run? 1. ____________________ 2. ____________________ 3. ____________________ 4. ____________________ The internal combustion engine operated based upon the principle of a ____________________? What are the four strokes that make up the repetitive cycle in a small engine? 1. ____________________ 2. ____________________ 3. ____________________ 4. ____________________ -