Market Segment:
Premium Maxi-Scooter
Competitors:
Honda Silver Wing, Suzuki Burgman 400, Kymco Xciting 400, Aprilia SR Max 400.
Vehicle Highlights:
Comfortable touring, ample storage, smooth performance, fuel efficiency, premium features for its class.
Engine Systems:
Engine overhaul, cylinder head, piston, crankshaft, lubrication, cooling, fuel injection, ignition system, starting system, charging system.
Transmission Systems:
Automatic Continuously Variable Transmission (CVT) system, clutch, drive belt, reduction gears.
Chassis Systems:
Frame, suspension (front telescopic forks, rear swingarm), steering system, wheels, tires.
Braking Systems:
Front and rear brake systems (disc brakes), hydraulic lines, brake fluid, master cylinders, calipers, parking brake.
Electrical Systems:
Wiring diagrams, lighting, instruments, battery, fuses, relays, electronic control unit (ECU), sensors, starter motor, alternator.
Bodywork And Fittings:
Fairings, seat, storage compartment, leg shields, maintenance access panels.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, air filter cleaning/replacement, coolant checks, tire pressure monitoring, brake pad inspection.
Troubleshooting:
Diagnostic charts, common problem identification, symptom-based solutions for engine, electrical, and mechanical issues.
Repair And Rebuild:
Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly for all major systems.
Technical Data And Specifications:
Torque specifications, clearances, fluid capacities, wiring diagrams, schematics, diagnostic trouble codes (DTCs).
Depth Of Information:
Comprehensive, covering all aspects from basic checks to complete engine and transmission rebuilds.
Engine Type:
Four-stroke, liquid-cooled, SOHC, 4-valve
Bore X Stroke:
83.0 mm x 73.0 mm
Compression Ratio:
10.0:1 (approx.)
Horsepower:
Approx. 27-30 HP (depending on model year and market)
Torque:
Approx. 30-33 Nm (depending on model year and market)
Fuel Delivery:
Electronic Fuel Injection (EFI) with Yamaha's Throttle Position Sensor (TPS) and Idle Speed Control (ISC).
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Transmission Type:
Automatic CVT (Continuously Variable Transmission)
Drive Type:
Belt drive to rear wheel
Clutch Type:
Wet, centrifugal automatic clutch
Transmission Fluid Type:
Yamalube Gear Oil (or equivalent API GL-4, SAE 80)
Transmission Fluid Capacity:
Typically around 0.2 liters (check manual for exact specification)
Safety Features General:
Integrated design, stable chassis, effective braking.
Braking System Type:
Linked Front and Rear Disc Brakes (in some markets/variants).
Anti Lock Braking System ABS:
Available as an option on some models.
Lighting:
Dual headlights, LED taillight.
Instrument Cluster:
Digital/analog combination meter with speedometer, tachometer, fuel gauge, coolant temperature gauge, clock, trip meters.
ABS Availability:
Optional ABS system enhances braking safety.
Power Outlet:
Often includes a 12V power outlet for charging devices (check specific model).
Engine Oil Change:
Every 5,000 km or 6 months, whichever comes first (refer to manual for precise interval).
Oil Filter Replacement:
At every engine oil change.
Air Filter Cleaning:
Every 5,000 km, replace as needed.
Spark Plug Replacement:
Check every 10,000 km, replace as needed (specific plug type is critical).
Cv Drive Belt Inspection:
Inspect every 10,000 km, replace typically around 20,000-30,000 km or when wear is evident.
Engine Oil Type:
Yamalube 4-AT Premium 10W-40 or equivalent JASO MA, API SG or higher.
Engine Oil Capacity:
Approx. 1.8 liters (without filter), 2.0 liters (with filter) - verify in manual.
Coolant Type:
High-quality ethylene glycol-based antifreeze coolant with distilled water (50/50 mix).
Brake Fluid Type:
DOT 4 recommended (verify in manual for specific requirement).
Common Wear Items:
CVT drive belt, front fork seals, brake pads, wheel bearings, exhaust system components (due to heat).
Potential Electrical Concerns:
Occasional issues with rectifier/regulator or stator on older models; wiring harness integrity checks are important.
Engine Performance Notes:
Can be sensitive to air filter cleanliness and fuel quality; ensure proper intake air management.
Manufacturer:
Yamaha Motor Company, Japan
Introduction Year:
Introduced in the early 2000s (e.g., 2002 for the YP400 Majesty).
Key Updates:
Significant updates often include engine refinements for emissions, ABS integration, cosmetic changes, and feature enhancements like improved lighting or seating.
Manufacturing Locations:
Primarily manufactured in Japan and potentially other Yamaha facilities globally.
