Market Position:
The Yamaha YP400 Majesty is a maxi-scooter known for its comfort, practicality, and performance, often competing with models like the Suzuki Burgman 400 and Honda Forza series. This manual targets owners and independent repair shops seeking professional-level repair and maintenance information.
Competitive Analysis:
This service manual provides dealership-level information, which is superior to generic online forums or basic repair guides. It ensures accurate diagnosis and repair, crucial for maintaining the longevity and performance of the YP400 Majesty.
Key Features:
Comprehensive coverage, digital format for instant access and print-on-demand, detailed diagrams and schematics, designed for accuracy and efficiency in repairs.
Coverage Areas:
Engine, General Information, Transmission, Chassis, Lighting, Steering, Seat System, Clutch, Suspension, Locks, Brakes, Lubrication, Electrical System, Frame, Fuel System, Battery
Page Count:
Estimated 400-600 pages (typical for a comprehensive service manual of this type)
Manual Type:
Service Repair Workshop Manual
Format:
Adobe Acrobat PDF
Delivery Method:
Instant digital download.
System Compatibility:
Compatible with PC and Mac operating systems.
Internet Requirement:
High-speed internet connection recommended due to file size.
Systems Covered:
Complete coverage of all mechanical and electrical systems, including engine internal components, fuel delivery, ignition, cooling, lubrication, exhaust, CVT transmission, drive belt, final drive, braking system (front and rear), suspension (front telescopic forks, rear unit swing arm), steering mechanism, lighting circuits, electrical components, battery, starter, charging system, body panels, seating, and chassis.
Procedures Included:
Detailed step-by-step repair and maintenance procedures, disassembly and reassembly instructions, troubleshooting guides, diagnostic procedures, electrical system schematics, torque specifications, tightening sequences, component testing, periodic maintenance schedules, and overhaul procedures.
Technical Depth:
Comprehensive, suitable for professional technicians and experienced DIY mechanics. Covers everything from routine maintenance (oil changes, filter replacements, spark plugs) to major component overhauls and electrical diagnostics.
Wiring Diagrams:
Includes detailed electrical system diagrams for all components, circuits, and troubleshooting.
Troubleshooting Procedures:
Systematic troubleshooting flowcharts and symptom-based diagnostic procedures for common and complex issues.
Engine Rebuild Procedures:
Detailed instructions for engine disassembly, inspection, repair, and reassembly, including piston, cylinder, crankshaft, valve train, and cylinder head procedures.
Frame And Body Repair:
Information on frame inspection, body panel removal and installation, seat assembly, and storage compartment maintenance.
Brake System Service:
Procedures for brake pad replacement, caliper service, brake fluid flush and replacement, and bleeding procedures.
Suspension Service:
Instructions for fork oil replacement, seal replacement, and rear shock absorber inspection and service.
Torque Specifications:
Comprehensive list of all critical torque values for engine, chassis, and component fasteners.
Exploded View Diagrams:
Detailed exploded view diagrams for all major assemblies, aiding in parts identification and disassembly/reassembly.
Primary Engine:
400cc, Liquid-cooled, 4-stroke, SOHC, 4-valve
Horsepower:
Approximately 28.4 HP @ 7500 RPM (varies slightly by region)
Torque:
Approximately 31.4 Nm @ 6000 RPM (varies slightly by region)
Fuel System:
Fuel Injection (EFI)
Oil Type:
Yamaha recommends Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher.
Cooling System:
Liquid-cooled
Ignition System:
TCI (Transistor Controlled Ignition)
Bore X Stroke:
95.0 mm x 67.0 mm
Compression Ratio:
9.6 : 1
Active Safety Features:
Combined braking system (front disc, rear disc), good visibility due to integrated lighting.
Passive Safety Features:
Stable chassis design, comfortable seating position for rider control, under-seat storage.
Lighting System:
Halogen headlights, LED taillight, turn signals.
Infotainment Features:
Basic features focused on rider comfort and information. Integrated dashboard with speedometer, tachometer, fuel gauge, odometer, trip meter, and indicator lights.
Driver Assistance Features:
No advanced electronic driver assistance systems common on modern cars. Focus is on reliable mechanical and electrical operation.
Connectivity Features:
None.
Lighting Technology:
Halogen headlights for primary illumination, LED technology for taillight and brake light for increased visibility and longevity.
Initial Service:
Check and adjust clutch, change engine oil and filter, inspect drive belt at 1000 km (600 miles).
Regular Service:
Engine oil change every 5000 km (3000 miles) or annually, drive belt inspection/replacement every 20,000 km (12,000 miles) or as needed, spark plug replacement every 10,000 km (6,000 miles).
Engine Oil Capacity:
1.90 Liters (without filter change), 2.10 Liters (with filter change).
Coolant Type:
Permanent type antifreeze (ethylene glycol based) with distilled water (50:50 mixture).
Known Issues:
Some models may experience drive belt wear sooner than expected if ridden aggressively. Regular inspection is key. Water pump seal leaks can occur over time, which this manual will detail the replacement of.
Oil Filter Part Number:
Commonly 5YP-13440-00 or equivalent (verify with specific parts catalog).
Air Filter Maintenance:
Periodic inspection and cleaning/replacement of the air filter element as per the service interval schedule.
Battery Type Spec:
12V, 10 Ah (YTX12-BS or equivalent)
Spark Plug Type:
NGK CR9E (or equivalent)
Brand Heritage:
Yamaha Motor Company is a Japanese manufacturer known for its motorcycles, marine products, and musical instruments. Its motorcycle division has a long history of innovation and performance.
Model Evolution:
The YP400 Majesty was part of Yamaha's successful Majesty series of maxi-scooters, introduced to offer a comfortable and versatile riding experience for commuting and touring. The 2004 model represented a refinement of the earlier generations with features like fuel injection.
Production Years:
The YP400 Majesty was produced for many years, with significant updates and variations across model years. The 2004 model is part of the first generation featuring the 400cc engine.
