The factory Harley-Davidson manuals are the best of all available service manuals. However, in my years of spinning wrenches on Harleys, I've found parts manuals to be a valuable asset. The HD parts books show expanded views of each assembly. If you take anything off the bike then disassemble it there is no guesswork in the reassembly. This is an example of an expanded view(smooth bore CV carburetor). Notice each part is numbered and by studying the diagram it's a simple matter to reassemble the carb.
Obtaining the parts book/manual can be problematic. Some Harley-Davidson dealers don't/won't sell them. However, many dealers will sell a parts book with no problem One thing to keep in mind; parts books aren't sold every day, therefore , most will need to be ordered. Finally, much Harley-Davidson service work requires "special" tools available from Harley-Davidson or Kent Moore. Knock-off tools are around, however, in my experience, most aren't worth having. Good luck and happy motoring!