From MopedWiki

Here is a list of free, downloadable manuals for Derbi mopeds.

Parts Catalogs

• Derbi Laguna Sport parts catalog
• Derbi C-5 Diablo parts catalog (courtesy of Handybikes)
• Derbi DS50 parts catalog (courtesy of HandyBikes)
• Derbi Variant parts catalog (courtesy of HandyBikes)

Engine Repair Manuals

• Derbi flat-reed engine repair manual

Various

• Derbi Manuals - All of the above manuals, plus some.
• Motorcycle Manuals - This site has several different Derbi manuals. They may not (all?) be for mopeds, but hey, still good to know, right?