SERVICE AND OWNER MANUALS:

Want a special treat? Somebody out there decided to scan in put the Factory Service Manual online!
I haven't looked to see if it's all there, but it looks like a great deal of it is!
Honda Factory Manual Clymer Manual Haynes Manual
1980 CB650C Manual 1981 CB650 Manual CB650 Italian Manual

CB650Z Part Diagrams

*** All parts lists are in pdf format, and they are fairly large as you can see.
Here is a general fault finding chart
for motorcycle charging systems:
Electrex Fault Finder Chart (PDF)
And here is a CB650 color wiring diagram
in case you're missing the manual:
CB650 Color Wiring Diagram (JPG)

NOTE: The above owners manual links have been thoughtfully provided by http://www.honda4fun.com, and hosted locally on my server to avoid stealing their bandwidth.

This was done because, unfortunatly, the site is in Italian and proves rather difficult to navigate. You can use the Altavista Bablefish translator if you wish to attempt to read it.