Vehicle Segment:
Maxi-scooter, commuter-oriented, touring capable.
Target Demographic:
Commuters seeking comfort and practicality, touring riders, urban dwellers needing efficient transportation.
Key Competitors:
Suzuki Burgman 400, Honda Silver Wing 600 (older models), Kymco Xciting 500.
Vehicle Strengths:
Spacious under-seat storage, comfortable seating position, aerodynamic fairing for wind protection, robust engine, stable handling.
Manual Value Proposition:
Provides essential information for owners and technicians to maintain, diagnose, and repair the Yamaha Majesty 400 YP400, ensuring longevity and optimal performance.
Engine Systems:
Engine specifications, disassembly, assembly, lubrication, cooling, fuel system, ignition system, exhaust system, emissions control, engine management (ECU diagnostics).
Drivetrain Systems:
Automatic Transmission (CVT), drive clutch, driven clutch, belt, final drive (gearbox), lubrication, troubleshooting.
Chassis Systems:
Frame, suspension (front fork, rear shock absorber), steering system, wheel bearing replacement, alignment checks.
Braking Systems:
Front and rear brake systems (hydraulic disc brakes), brake fluid specifications, caliper service, pad replacement, bleeding procedures, ABS (if equipped).
Electrical Systems:
Battery, charging system (stator, regulator/rectifier), starting system (starter motor, solenoid), lighting system (headlight, taillight, signals), instrumentation, wiring diagrams, fuse box, ECU, sensors.
Bodywork And Trim:
Fairings, seat removal, storage compartments, body panel disassembly and reassembly, graphics, trim pieces.
Maintenance Procedures:
Oil and filter changes, air filter inspection/replacement, spark plug replacement, coolant checks and changes, drive belt inspection/replacement, brake fluid service, tire pressure checks, lubrication points.
Troubleshooting Guides:
Diagnostic flowcharts for common starting issues, running problems, electrical faults, braking issues, and drivetrain anomalies.
Major Repair Procedures:
Engine top-end rebuild (cylinder head, piston), transmission overhaul, clutch replacement, front fork overhaul, rear shock replacement, carburetor/fuel injection system service.
Diagnostic Procedures:
Fault code retrieval (if applicable), diagnostic tool usage (if specified), sensor testing, electrical continuity checks.
Depth Level:
Comprehensive: Covers routine maintenance, intermediate repairs, and full engine/transmission rebuilds. Includes detailed specifications and torque values.
Engine Type:
4-stroke, Liquid-cooled, DOHC, 4-valve
Bore X Stroke:
92.0 mm x 75.0 mm
Compression Ratio:
11.0:1
Fuel Delivery:
Fuel Injection (Mikuni DFI)
Ignition System:
TCI (Transistor Controlled Ignition)
Spark Plug Type:
NGK CR9E
Starter System:
Electric Starter
Estimated Horsepower:
~34 hp @ 7500 rpm
Estimated Torque:
~38 Nm @ 6000 rpm
Fuel Tank Capacity:
14.0 Liters (3.7 gal)
Recommended Fuel:
Unleaded gasoline, Octane rating 87 or higher
Transmission Type:
Automatic (CVT - Continuously Variable Transmission)
Drive System:
V-belt automatic
Final Drive:
Gear Reduction, Automatic Clutch
Clutch Type:
Dry, centrifugal, automatic
Transmission Fluid Spec:
Yamalube Gear Oil (or equivalent SAE 80W-90)
Crash Test Ratings:
N/A (Motorcycle/Scooter segment generally does not have standardized crash test ratings like automobiles).
Braking System Type:
Hydraulic Disc Brakes (Front and Rear)
ABS Availability:
Optional on some models/markets. Not standard on all 2005-2007 YP400 variants.
Lighting:
Halogen Headlight, LED Taillight, Turn Signals.
Parking Brake:
Yes (Lever actuated)
Instrument Cluster:
Analog speedometer and tachometer, digital display for odometer, trip meters, fuel gauge, coolant temperature gauge, clock.
ABS System:
Available as an option on some models, enhancing braking stability.
ECU Features:
Engine Control Unit (ECU) manages fuel injection timing, ignition timing, and idle speed control. Diagnostic port for ECU access.
Engine Oil Change Interval:
Every 5,000 km (3,000 miles) or 6 months
Oil Filter Replacement Interval:
Every 10,000 km (6,000 miles) or 12 months
Air Filter Inspection Interval:
Every 5,000 km (3,000 miles)
Drive Belt Inspection Interval:
Every 10,000 km (6,000 miles)
Spark Plug Replacement Interval:
Every 10,000 km (6,000 miles) or as needed based on inspection
Brake Fluid Change Interval:
Every 2 years or 20,000 km (12,000 miles)
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Engine Oil Capacity:
2.4 Liters (2.5 US qt) without filter change, 2.6 Liters (2.7 US qt) with filter change
Coolant Type:
Yamaha Coolant (or equivalent) 50/50 mixture of ethylene glycol and deionized water
Brake Fluid Type:
DOT 4 hydraulic brake fluid
Common Wear Items:
Drive belt, brake pads, tires, fork seals due to mileage and use.
Potential Electrical Issues:
Regulator/rectifier failure (common in many Yamaha models of this era), battery health degradation.
Engine Performance Notes:
Generally reliable, but proper maintenance of fuel system and air filter is crucial for optimal performance. Occasional issues with fuel injectors if contaminated fuel is used.
Manufacturer:
Yamaha Motor Company, a globally recognized leader in motorcycle and scooter manufacturing.
Yp400 Introduction:
The Majesty 400 (YP400) was introduced to compete in the growing maxi-scooter market, offering a blend of comfort, performance, and utility.
Generations:
This generation (2004-2006 globally, with continued sales into 2007 in some markets) featured the fuel-injected 395cc engine. Later generations saw updates to styling and features.
Manufacturing Origin:
Primarily assembled in Japan, with components sourced globally.
