The purpose of this book is to serve as a helpful guide to mechanics and students whose work deals with the operation, maintenance and repairs of modern gas engines of various types and sizes. The book explains the operating principles of various types of gas engines. It then goes on to illustrate the function of the various engine parts and necessary accessories, such as carburetors, fuel ignition methods, cooling and lubricating systems, etc. It also deals with troubleshooting and modern service operations, including engine tune-up and emission control procedures. The various ignition system items that affect engine performance are fully listed and illustrated. - Foreword.