Petrol engines have a very special fascination as a drive for model aircraft – if only because of their unmistakable sound. But the fact that these drives also have their own very special peculiarities is another matter. Franz Kayser is a specialist in petrol engines as model aircraft drives and knows their strengths, weaknesses and all the challenges associated with them. In his column "Hier riecht's nach Sprit" (“It smells like fuel here”) in the trade magazine FMT, he regularly addresses the special features of these engines and reveals tips and tricks for conversion and operation. This book is based on the experience of this column and provides the fan of petrol engines – and those who want to become one – with the basics and comprehensive information. "From practice, for practice" is the motto of this book, so that the petrol engine not only fascinates, but also runs smoothly and reliably. From the content: • A look under the skin, general engine construction • The carburettor • The right twist: carburettor adjustment • The intake control • Adjusting the ignition timing • Power for the ignition • What goes in must come out • The smoke system • Fuel and oil • Troubleshooting • It should be tight and stay tight • Conservation and cleaning • A little more peace and quiet please!