The second edition of this text expands and updates its already thorough coverage of the operation, maintenance and repair of small, air-cooled gas engines. It features new chapters on failure analysis, and starter systems, as well as a rewrite of the electrical chapter to include feedback systems and fuel injection. An expansion of the carburation chapter includes new carburetors including carb 1 carburetors. This text is now accompanied by a comprehensive competency-based workbook.