Scooter service and repair manuals are available on 49ccscoot.com, absolutelyscooters.net and carlsalter.com as of July 2015. Each website contains service and engine manuals for several manufacturers, including Honda, Peugoet and Vespa. Troubleshooting guides are also available.
The largest variety of service and repair manuals is on 49ccscoot.com. Carlsalter.com only offers manuals for Piaggio and Vespa brand scooters. From either website, right-click on the type of manual desired and download it to your hard drive in PDF format.
Absolutelyscooters.net offers a variety of Chinese scooter owner's manuals, limited service and repair manuals, parts diagrams and service tips. They also offer a discussion forum and sell parts.