Hans, thank you for producing the English edition of your book. I bought a copy last Spring and reviewed it in the Yamaha 650 Society News. The way you organized the material and managed detail impressed me greatly. Guys, Hans' book covers every system in the motor in a series of steps. You're told in simple, nontechnical language exactly how each system works, how to take it apart, how to examine it for defects, and how to put it back together, with photographs that show you what you'll find before you start taking things apart. Even if you never plan to open your motor and just want a better understanding of how it works, you should have this book.