Product Type:
Maxi-scooter, popular in urban commuting and light touring.
Brand Synergy:
Covers both Yamaha Majesty and MBK Skyliner models, as MBK is a subsidiary of Yamaha, sharing significant platform components.
Competitors Segment:
Competes with other 125cc and 150cc scooters from brands like Honda (e.g., SH125/150), Suzuki (e.g., Burgman 125/150), Kymco, and Piaggio.
Design Philosophy:
Designed for comfort, practicality, and performance in urban environments, with a step-through chassis and underseat storage.
Value Proposition:
Essential resource for owners and independent mechanics to maintain and repair the scooter efficiently and correctly.
Engine Mechanical:
Engine disassembly, assembly, inspection, tuning, valve clearance, piston/cylinder, crankshaft, lubrication system.
Fuel System:
Carburetor (or Fuel Injection for specific variants if applicable), fuel pump, fuel lines, fuel tank inspection and cleaning.
Cooling System:
Radiator, cooling fan, thermostat, coolant circulation, water pump.
Exhaust System:
Exhaust pipe, muffler, catalytic converter (if equipped), heat shields.
Transmission Drivetrain:
Automatic transmission (CVT), clutch, drive belt, variator, torque converter, final drive.
Brakes:
Front and rear brake systems (disc/drum), brake levers, calipers, master cylinders, brake lines, brake pads, brake fluid replacement.
Suspension:
Front forks (telescopic), rear shock absorber(s), linkage, swingarm, spring preload adjustment.
Steering:
Handlebar, steering stem, bearings, steering lock.
Electrical System:
Battery, charging system (stator, regulator/rectifier), ignition system (CDI, spark plug), lighting (headlight, taillight, signals), starter motor, horn, wiring diagrams.
Bodywork Frame:
Chassis, frame inspection, body panels, seat, storage compartment, fairings, plastics removal and installation.
Wheels Tires:
Wheel inspection, tire pressure, tire replacement, rim condition.
Routine Maintenance:
Oil change, filter replacement, spark plug replacement, air filter cleaning/replacement, brake pad inspection, coolant level check.
Troubleshooting:
Diagnostic procedures for common starting issues, running problems, electrical faults.
Disassembly Assembly:
Step-by-step instructions for disassembling and reassembling major components and systems.
Technical Adjustments:
Carburetor tuning, idle speed adjustment, brake lever adjustment, suspension preload adjustment.
Electrical Diagnostics:
Interpreting wiring diagrams, testing electrical components, diagnosing charging and ignition faults.
Rebuilding Overhauling:
Detailed instructions for engine and transmission overhauls.
Depth Of Coverage:
Comprehensive, covering from basic maintenance to major component overhauls and complex diagnostics.
Detail Level:
Extremely detailed with hundreds of images and electrical schematics.
Engine Type 125:
4-stroke, liquid-cooled, SOHC, 2-valve (typical configuration, specific details in manual).
Engine Type 150:
4-stroke, liquid-cooled, SOHC, 2-valve (typical configuration, specific details in manual).
Displacement 125:
~125 cc (exact figures in manual)
Displacement 150:
~150 cc (exact figures in manual)
Horsepower Range 125:
Approximately 10-12 HP (peak figures vary by market and exact model year).
Horsepower Range 150:
Approximately 12-14 HP (peak figures vary by market and exact model year).
Fuel Delivery Typical:
Carburetor (Mikuni or Keihin, specific model in manual) for most variants in this period. Some later models might feature fuel injection.
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type Recommendation:
Yamaha recommends specific viscosity grades (e.g., 10W-40 or 20W-40) and API service classifications, detailed in the manual.
Crash Test Data:
As a scooter, formal automotive crash safety ratings are not typically applicable in the same way as cars. Focus is on operational safety.
Braking System:
Combined braking systems (e.g., front disc, rear drum or disc) designed for stable deceleration.
Lighting:
Adequate lighting for visibility (headlight, taillight, brake light, turn signals).
Chassis Stability:
Designed for stable handling characteristics in urban environments.
Instrument Cluster:
Analog/digital combination instrument cluster displaying speed, RPM, fuel level, odometer, trip meter, and warning lights.
ABS Availability:
ABS was not standard or widely available on many models in this generation, though some markets might have had optional ABS. Manual will clarify if applicable.
Connectivity Features:
Basic connectivity, primarily focused on operational status via dashboard indicators.
Engine Oil Change:
Typically every 3,000-5,000 km or annually, as specified in the manual. Clutch/variator oil (if separate) will have its own interval.
Air Filter Maintenance:
Inspection and cleaning/replacement at intervals like 5,000-10,000 km, depending on operating conditions. Manual provides specific guidance.
Spark Plug Replacement:
Recommended replacement interval often around 10,000-20,000 km, depending on plug type (standard vs. iridium). Manual will specify part number and interval.
Drive Belt Inspection Replacement:
Inspection usually around 10,000 km, replacement typically 20,000-30,000 km. Crucial for CVT function.
Coolant Type:
Ethylene glycol-based antifreeze, mixed with distilled water. Specific Yamaha coolant or equivalent recommended. Capacity and type in manual.
Final Drive Gear Oil:
Hypoid gear oil, typically SAE 80W-90 or similar. Capacity and specific type detailed in manual.
Common Wear Items:
Brake pads, tires, drive belt, battery, fork seals are common wear items. The manual provides replacement procedures.
Electrical Connectors:
Corrosion on electrical connectors can sometimes cause intermittent issues, requiring cleaning and dielectric grease as per manual advice.
Charging System:
Stator or regulator/rectifier failure can occur over time, affecting battery charging. Manual helps diagnose these.
Yamaha Motorcycles:
Yamaha Motor Corporation is renowned for its extensive range of motorcycles, ATVs, and watercraft, known for engineering excellence and performance.
Mbk History:
MBK (Motos Legendre et Kahn) is a French manufacturer, acquired by Yamaha in 1987, often producing models that share Yamaha platforms and technology.
Majesty Skyliner Lineage:
The Majesty/Skyliner line represents Yamaha/MBK's commitment to the maxi-scooter segment, offering a blend of motorcycle-like comfort and scooter practicality.
Manufacturing Locations:
Likely manufactured in Yamaha's global production facilities, potentially including Japan, Europe, or Southeast Asia.
