Segment:
Maxi-scooter, designed for comfortable commuting and touring.
Competitors:
Competes with other 400cc class maxi-scooters from brands like Suzuki (Burgman 400), Kymco, and Piaggio.
Comfort:
Spacious seating, good wind protection, and ample storage contribute to rider comfort.
Performance:
Offers a good balance of power and fuel efficiency for urban and highway use.
Practicality:
Generous under-seat storage and a stable chassis make it a practical choice for daily use.
Engine Service:
Detailed procedures for disassembly, inspection, repair, and reassembly of the 400cc engine.
Transmission Service:
Coverage of the automatic transmission (CVT system), including clutch, variator, and belt maintenance.
Fuel System:
Inclusion of fuel injection system diagnostics, pump, injector service, and fuel tank maintenance.
Electrical System:
Comprehensive wiring diagrams, ignition system, lighting, charging system (stator, regulator/rectifier), starter, and battery maintenance.
Braking System:
Front and rear brake caliper service, hydraulic lines, master cylinders, brake fluid replacement, and ABS (if equipped) system diagnostics.
Suspension And Steering:
Front fork overhaul, rear shock absorber service, steering head bearing inspection and replacement, and linkage adjustments.
Cooling System:
Radiator, coolant pump, thermostat, and fan service; coolant flush and replacement procedures.
Exhaust System:
Exhaust pipe and muffler maintenance, gasket replacement, and emissions control components.
Frame And Bodywork:
Fairing removal and installation, seat mechanisms, luggage compartment access, and chassis component inspection.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, drive belt inspection and replacement, tire pressure checks, and lubrication points.
Troubleshooting Guides:
Diagnostic flowcharts and common problem identification for various systems (e.g., starting issues, poor performance, electrical faults).
Rebuild Procedures:
Detailed step-by-step instructions for rebuilding major components like the engine and transmission.
Torque Specifications:
Critical torque values for all fasteners to ensure proper assembly and prevent damage.
Electrical Diagnostics:
Guidance on using multimeters and diagnostic tools to identify and resolve electrical issues.
Suspension Adjustments:
Instructions for adjusting suspension settings for optimal handling and rider comfort.
Special Tool Requirements:
Identification of specific tools required for certain maintenance and repair tasks.
Diagnostic Capabilities:
Advanced diagnostic procedures for engine control unit (ECU) and sensor readings.
Overhaul Detail:
Comprehensive details on dismantling, inspecting, and reassembling all major vehicle components for a full restoration.
Component Identification:
Clear identification of all parts and their functions within each system.
Engine Type:
Liquid-cooled, four-stroke, SOHC, four-valve single-cylinder
Bore X Stroke:
83.0 mm x 73.0 mm
Compression Ratio:
10.0:1 (Typical, refer to manual for exact specification)
Horsepower:
Approx. 27.7 HP @ 6,000 RPM (Actual figures may vary by region and specific model year)
Torque:
Approx. 26.4 lb-ft @ 5,250 RPM (Actual figures may vary by region and specific model year)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline, minimum 87 octane
Oil Type:
Yamalube (or equivalent) 10W-40 Synthetic or Semi-Synthetic motorcycle oil
Oil Capacity:
Approx. 1.7 Liters (with filter change)
Ignition System:
TCI (Transistor Controlled Ignition)
Spark Plug Type:
CR9E (Denso) or equivalent
Safety Features Overview:
Designed with integrated lighting, reliable braking, and a stable chassis for rider safety.
Braking System Type:
Hydraulic disc brakes front and rear. Some models may feature ABS (Anti-lock Braking System).
Lighting System:
Multi-reflector headlight, LED taillight, and turn signals for enhanced visibility.
Chassis Design:
Steel tube frame provides a rigid and stable platform.
Engine Oil Change:
Every 3,000 km or 6 months, whichever comes first.
Air Filter Cleaning:
Every 3,000 km, replace as needed.
Drive Belt Inspection:
Every 6,000 km, replace at 12,000 km or if wear is evident.
Spark Plug Replacement:
Every 6,000 km or 1 year.
Brake Fluid Flush:
Every 2 years.
Coolant Type:
Yamaha Super Coolant (or equivalent) - Ethylene glycol based, 50/50 mix with distilled water.
Common Wear Items:
Drive belt, front fork seals, brake pads, and battery are common wear items that may require periodic replacement.
Potential Failures:
While generally reliable, some owners report occasional issues with the starter motor or regulator/rectifier, especially with higher mileage. Proper maintenance is key.
Yamaha History:
Yamaha Motor Company, a Japanese manufacturer, is renowned for its long history of producing high-quality motorcycles, scooters, and musical instruments.
Majesty Lineage:
The Majesty series is Yamaha's line of comfortable and practical maxi-scooters, with the YP400 representing a significant displacement in the lineup, offering enhanced performance for longer rides.
Manufacturing Location:
Primarily manufactured in Japan, with some components sourced globally.
