Segment:
Maxi-scooter / Sport scooter
Target Audience:
Commuters, touring riders, enthusiasts seeking a comfortable and capable large-displacement scooter
Key Competitors Era:
Suzuki Burgman 400, Honda Silver Wing 400/600, Kymco Xciting 400
Design:
Aerodynamic bodywork, comfortable seating, integrated storage, motorcycle-like chassis elements
Performance:
Strong engine performance for highway cruising and acceleration, responsive CVT
Handling:
Stable chassis, capable suspension for a scooter, good braking performance
Comfort:
Spacious seating, wind protection, ergonomic rider triangle
Engine:
Complete engine disassembly, inspection, repair, and reassembly (including cylinder head, pistons, crankshaft, lubrication system, cooling system)
Fuel System:
Fuel injection system, fuel pump, injectors, fuel filter, throttle body
Transmission:
Automatic CVT (Continuously Variable Transmission) system, drive belts, clutch, gears, lubrication
Electrical System:
Wiring diagrams, charging system (stator, regulator/rectifier), starting system (starter motor, battery), ignition system, lighting, instruments, sensors
Brakes:
Front and rear brake systems, hydraulic lines, master cylinders, calipers, brake pads, rotors, parking brake
Suspension:
Front telescopic forks, rear swingarm, shock absorbers, linkage (if applicable), bearings
Steering:
Handlebars, steering stem, bearings, linkages
Cooling System:
Radiator, fan, coolant hoses, thermostat, water pump
Exhaust System:
Exhaust pipes, muffler, catalytic converter (if applicable)
Frame And Bodywork:
Chassis components, fairings, panels, seat, storage compartment, mounting hardware
Maintenance:
Routine checks, oil changes, filter replacements, spark plug service, brake fluid changes, coolant checks
Troubleshooting:
Diagnostic procedures, identification of common problems, fault finding charts
Repair:
Step-by-step instructions for component replacement and repair
Rebuilding:
Detailed instructions for complete engine and transmission rebuilds
Adjustment:
Carburetor/throttle body synchronization, idle speed adjustment, brake lever adjustment
Inspection:
Pre-ride checks, detailed component inspection guidelines
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission overhauls.
Detail Level:
Highly detailed with exploded views, diagrams, torque specifications, and special tool requirements.
Engine Type:
Four-stroke, liquid-cooled, SOHC, 4-valve
Displacement:
395 cc (24.1 cu in)
Bore X Stroke:
83.0 mm x 73.0 mm (3.27 in x 2.87 in)
Compression Ratio:
10.0:1
Horsepower Approx:
31.5 hp @ 7500 rpm (approximate, may vary by market/tuning)
Torque Approx:
31.0 Nm @ 6000 rpm (approximate, may vary by market/tuning)
Fuel Delivery:
Fuel Injection (throttle body size typically 40mm)
Fuel Type:
Unleaded gasoline
Fuel Capacity:
14 Liters (3.7 US gal)
Oil Type Specification:
Yamalube 4-stroke motorcycle oil, API SG or higher, SAE 10W-40 recommended (Refer to manual for specific viscosity and API classification for operating temperature)
Oil Capacity W Filter:
Approx. 2.2 Liters (2.3 US qt)
Coolant Type Specification:
Yamaha-specific liquid-cooled coolant (Ethylene Glycol based) with rust inhibitors. Mix 1:1 with distilled water. (Refer to manual for exact specification and ratio).
Length:
Approx. 2,200 mm (86.6 in)
Width:
Approx. 775 mm (30.5 in)
Height:
Approx. 1,420 mm (55.9 in) (seat height varies)
Wheelbase:
Approx. 1,545 mm (60.8 in)
Dry Weight:
Approx. 187 kg (412 lbs)
Wet Weight:
Approx. 200 kg (441 lbs) (curb weight, with fluids)
Underseat Storage:
Ample space, typically accommodates two full-face helmets
Glove Box:
Yes, front mounted
Safety Certification:
CE, EPA, CARB (depending on market)
Braking System:
Front: Dual disc brakes, Rear: Single disc brake. Some models may feature ABS (Anti-lock Braking System) as an option or standard depending on market.
Lighting:
Halogen headlights, LED taillights (depending on year/trim), turn signals
Chassis Design:
Rigid frame providing stability
Mirrors:
Large, adjustable mirrors for enhanced visibility
Instrument Cluster:
Digital LCD display with analog tachometer, speedometer, odometer, trip meter, fuel gauge, clock, and various warning lights.
ABS:
Available as an option on some models/markets, enhancing braking safety.
Charging Port:
Typically includes a 12V accessory socket for charging mobile devices.
ECM:
Engine Control Module (ECM) manages fuel injection and ignition timing for optimal performance and emissions.
Oil Change Interval:
Every 5,000 km (3,000 miles) or 6 months, whichever comes first (Refer to manual for precise interval).
Air Filter Inspection:
Every 5,000 km (3,000 miles) or 6 months. Replacement as needed.
Spark Plug Replacement:
Every 10,000 km (6,000 miles) or 1 year (Refer to manual for correct plug type).
Transmission Oil Change:
Every 10,000 km (6,000 miles) or 1 year.
Coolant Flush Interval:
Every 2 years or 20,000 km (12,000 miles), whichever comes first.
Drive Belt Inspection:
Every 10,000 km (6,000 miles). Replacement typically around 20,000-30,000 km (12,000-18,000 miles) depending on wear.
Engine Oil:
Yamalube 4-stroke motorcycle oil, API SG or higher, SAE 10W-40 recommended. Capacity: 2.2 L with filter.
Gear Oil:
SAE 80 API GL-4.
Coolant:
Ethylene Glycol based, 1:1 with distilled water. (Check manual for Yamaha's specific blend and anti-corrosive additive requirements).
Brake Fluid:
DOT 3 or DOT 4 (Check manual for specific type and DOT rating).
Common Wear Items:
Drive belt, starter motor brushes, battery, suspension bushings.
Electrical Component Reliability:
While generally reliable, voltage regulator/rectifier can be a potential failure point on older models; inspect regularly.
Engine Performance Degradation:
Can occur due to carbon buildup in combustion chamber or worn valve seals, requiring decarbonization or cylinder head service.
Maintenance Schedule Notes
Importance Of Manual:
This manual provides the definitive schedule and specifications, overriding any generic advice. Adhering to it is crucial for longevity.
Yamaha Motorcycles:
Yamaha Motor Company, Ltd. is a Japanese manufacturer of motorcycles, marine products, and other motorized products. Founded in 1955, it has a long history of innovation and performance in the automotive and powersports industries.
Yp Series:
The YP400 Majesty is part of Yamaha's esteemed 'Majesty' line of maxi-scooters, known for blending comfort, practicality, and sporty performance.
Yp400 Introduction:
The YP400 Majesty was introduced to the market to compete in the growing large-displacement scooter segment, offering a refined riding experience and substantial power.
Manufacturing Location:
Primarily manufactured in Japan and/or other Yamaha global facilities.
