The Clymer manual is a complete tutorial on the service, repair and maintenance for your 1979-82 Honda CB650 motorcycle. Though not containing as many pictures and illustrations as, say, the Chilton book, the text is superior, especially Chapter (2) devoted to troubleshooting nearly any problem you might encounter. I've used it to do jobs on my '80 CB650C ranging from rebuilding the top-end, replacing swingarm bearings, R&R'ing ignition coils, valve-adjustments and simple tune-ups. Errors are few, though the coil diagram #36, p.229 is a bit misleading.