All of the major air-cooled Briggs and Stratton manuals are now in the engine manuals section, which requires subscription, Justo. That is the early manual (Repairman's Handbook for Older Engines 1919-1981), the classic manual (Service and Repair Instructions 1984), the last of the side valve manuals (P/N 270962 Single Cylinder, and P/N 271172 Opposed Piston Twin) and the Vanguard manuals (P/N 272144 Twin Cylinder OHV and P/N 272147 Single Cylinder OHV). We don't yet have the diesel or water-cooled manuals.