2004-2005 Yamaha Majesty 400 YP400(S) Service Manual

2004–2005 Yamaha Majesty 400 Technical Documentation

• Covers 2004–2005 Yamaha Majesty 400 YP400(S) scooters, including detailed service specifications for the 394.9 cc liquid-cooled DOHC engine and transmission assembly
• Original OEM publication 5RU1-AE1, dated December 2003
• Contains 37 exploded-view diagrams and 35 detailed torque tables for engine, chassis, and electrical system fasteners
• No shipping wait — the PDF is available immediately after purchase
• OCR text layer lets you jump to a torque spec by keyword
• This first edition documentation provides the primary build specifications for the 5RU1 and 5RU3 model variants.

Document Scope and Technical Highlights

Component and Systems Overview

This service publication details the maintenance and adjustment procedures for the Yamaha Majesty 400, providing extensive data on the fuel injection system, automatic centrifugal clutch, and cooling system circuits. The text covers the complete chassis breakdown, including steering head, front fork, and swingarm adjustment parameters, as well as electrical system reference values for the A.C. magneto, rectifier/regulator, and battery charging circuit.

Specification Previews

The manual lists critical technical data for workshop use, including valve clearance settings and what an OEM service publication covers to maintain the Majesty 400 performance. Valve clearance for the intake is listed at 0.15–0.20 mm in the cylinder head specification table. Radiator cap opening pressure is documented at 110.0–140.0 kPa. The Yamaha Majesty 400 fuel pump output pressure is specified at 250 kPa. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This 100-page official Yamaha OEM service manual covers the 2004–2005 Majesty 400, documenting engine, chassis, electrical, and fuel-injection specifications for the 5RU-series scooter build.