This 100 page manual covers all the radials produced from 1973 to 1975, plus the 501 Maicos. It goes into a great amount of detail with an emphasis on jetting the Bing carbs properly and electrical troubleshooting. There are also excellent step-by-step tear-downs of engine components and suspension parts. I scanned the copy in my library and am making it available in pdf format. For $10 (postage included in the US) you can have your own workshop manual on disc. The best part is that you can easily print out each and every page.