Yamaha EF5500D Service and Repair Manual
The service manual for the EF5500D is LIT-19616-02-24, and the EF5500DE is documented in the same volume. Yamaha's records give no separate model code for this unit, so the part number is the identifier that matters when ordering.
Pairing the D with the DE is normal practice where the electric-start version is otherwise the same machine. The manual keeps their specifications separate where the equipment differs.
Inside are the factory procedures: disassembly and reassembly in the specified sequence, inspection and measurement with service limits, torque figures, wiring diagrams for the generating and control circuits, periodic maintenance intervals, and troubleshooting worked from the symptom the generator shows.
Quote LIT-19616-02-24 and note whether your unit is the D or the DE before you start.