It's very clear, and I'm glad my local library has it. I'll check it out occasionally as I need it, but reading up on the OHV-style engine, and seeing the diagrams, was quite helpful.
Got the book with the goal to repair my busted lawnmower... I still haven't, but it wasn't the books fault. The diagrams, diagnostics, and directions were all good. I'll likely get it out again when I have a bit more time.