CD files are in Adobe .pdf format. Adobe Reader required for viewing files. Best deal > This standard size CD will contain the following 50 different Service Manuals, Parts Catalogs & Accessories Catalogs for various Vintage model Harley-Davidson’s made from 1940 - 1980.. Free Motorcycle Manuals for download . Lots of people charge for motorcycle service and workshop manuals online which is a bit cheeky I reckon as they are freely available all over the internet. £5 each online or download them in PDF format for free here!!.