Market Segment:
Premium Maxi-Scooter
Target Audience:
Commuters, touring riders, scooter enthusiasts seeking comfort and performance
Key Competitors Era:
Suzuki Burgman 400, Honda Silver Wing 400 (though often 600cc), Gilera Nexus 500
Vehicle Strengths:
Comfortable ride, ample storage, good weather protection, robust engine
Manual Value Proposition:
Authoritative guide for maintenance, repair, and diagnostics, empowering owners and independent shops.
Engine Systems:
Engine Assembly, Internal Components, Lubrication System, Fuel System (Injection), Ignition System, Cooling System (Liquid-Cooled), Starting System
Power Transmission:
Automatic Transmission (CVT), Drive Belt System, Final Drive
Chassis Systems:
Frame, Front Suspension (Telescopic Fork), Rear Suspension (Swingarm), Steering System
Braking Systems:
Front Brake (Disc), Rear Brake (Disc), Braking System Operation, Hydraulic System
Electrical Systems:
Wiring Harness, Lighting System (Headlight, Taillight, Indicators), Battery, Charging System (Alternator/Stator), Ignition System, Electrical Components, Troubleshooting Diagrams
Bodywork And Trim:
Body Panels, Fairings, Seat, Storage Compartment, Windscreen
Maintenance And Diagnostics
Maintenance Procedures:
Scheduled Maintenance, Oil Changes, Filter Replacements, Spark Plug Service, Valve Clearance Adjustment, Drive Belt Inspection/Replacement, Brake Pad Replacement, Fluid Checks/Replacements
Troubleshooting:
Systematic Diagnostic Procedures for Common Issues, Fault Code Identification (if applicable), Symptom-Based Troubleshooting
Engine Overhaul:
Engine Removal/Installation, Piston/Cylinder Inspection, Crankshaft/Connecting Rod Service, Cylinder Head Disassembly/Assembly, Camshaft Timing
Transmission Service:
CVT Unit Inspection, Drive Belt Replacement, Clutch/Torque Converter Service, Final Drive Gearbox Maintenance
Suspension And Steering:
Fork Seal Replacement, Shock Absorber Service, Steering Head Bearing Service
Brake System Repair:
Brake Fluid Bleeding, Caliper Service, Master Cylinder Overhaul, Disc Rotor Inspection
Electrical Diagnosis:
Wiring Diagram Interpretation, Component Testing (e.g., Starter Motor, Stator, Ignition Coil), Electrical Fault Finding
Special Tool Usage:
Identification and application of specialized tools for disassembly and assembly
Diagnostic Level:
Comprehensive diagnostic procedures for technicians
Repair Scope:
Detailed repair instructions covering all major components and systems
Maintenance Scope:
In-depth maintenance schedules and procedures
Information Source:
Manufacturer-produced original workshop manual content
Engine Type:
Four-stroke, Liquid-cooled, SOHC, 4-valve
Bore X Stroke:
92.0 mm x 75.0 mm
Compression Ratio:
11.0:1
Horsepower:
Approx. 33.3 PS (24.5 kW) @ 7,000 rpm (actual figures may vary slightly by region and specific year)
Torque:
Approx. 37.3 Nm (27.5 lb-ft) @ 6,000 rpm (actual figures may vary slightly by region and specific year)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded Gasoline
Fuel Tank Capacity:
14 Liters (approx. 3.7 US gallons)
Crash Test Ratings:
Not applicable to motorcycle/scooter segment in the same manner as automobiles.
Braking System:
Dual disc front, Single disc rear with hydraulic actuation.
Lighting:
Halogen headlight, LED taillight, integrated turn signals
Frame Construction:
Steel diamond frame for rigidity and rider safety.
Bodywork:
Full bodywork for rider protection from elements and minor debris.
Oil Change Interval:
Refer to manual for specific mileage/time intervals, typically every 3,000-5,000 km (1,800-3,000 miles) or annually.
Air Filter Inspection:
Regular inspection based on operating conditions, replacement as needed (e.g., every 10,000-15,000 km).
Drive Belt Inspection:
Inspect at first service, then every 10,000-20,000 km for wear and damage. Replacement typically advised around 20,000-30,000 km.
Spark Plug Replacement:
Refer to manual, typically around 10,000-20,000 km, depending on plug type.
Engine Oil Type:
Yamaha Recommend: Yamalube 4 (SAE 10W-40) or equivalent API SG or higher, JASO MA certified motorcycle oil.
Engine Oil Capacity:
Approx. 1.8 Liters (with oil filter change)
Coolant Type:
Permanent type anti-freeze coolant (50% solution) mixed with distilled water.
Final Drive Oil Type:
Yamaha Recommend: Yamalube Gear Oil 10W-30 or equivalent API GL-4.
Common Wear Items:
Drive belt, brake pads, tires, suspension bushings, starter motor brushes (less common but possible).
Potential Faults:
Occasional issues with the fuel pump or FI system sensors, coolant leaks if not properly maintained, CVT pulley wear over very high mileage.
Manufacturer History:
Yamaha Motor Company, established in 1955, renowned for its innovation in motorcycles, musical instruments, and marine products.
Majesty Lineage:
The YP400 Majesty is part of Yamaha's long-standing Majesty line, which began in the early 1990s with smaller displacement models, evolving into larger, more powerful maxi-scooters for European and global markets.
Production Period:
2005-2007 (covered by this manual)
Manufacturing Location:
Primarily manufactured in Japan, with potential assembly in other Yamaha facilities globally.