Engine:
General information, engine disassembly, assembly, inspection, specifications, troubleshooting
General Information:
Vehicle identification, service precautions, torque specifications, special tools
Transmission:
Automatic transmission (CVT) operation, inspection, maintenance, component identification, repair
Chassis:
Frame inspection, components, suspension mounting, bodywork
Lighting:
Headlights, taillights, turn signals, indicator lamps, wiring diagrams, bulb replacement
Steering:
Handlebar, steering stem, steering bearings, adjustment, inspection, troubleshooting
Seats System:
Seat mounting, unlocking mechanism, under-seat storage
Clutch:
Automatic centrifugal clutch inspection, maintenance, and component details
Suspension:
Front fork inspection, maintenance, seals, rear shock absorber, linkage (if applicable)
Locks:
Ignition switch, steering lock, seat lock operation and maintenance
Brakes:
Front and rear brake system inspection, hydraulic system, brake fluid, pad replacement, disc maintenance, caliper service
Lubrication:
Lubrication points, schedule, oil types, capacities
Electrical:
Battery, charging system, starter system, ignition system, lighting system, wiring diagrams, troubleshooting electrical faults
Frame:
Frame integrity inspection, mounting points, structural components
Fuel System:
Fuel tank, fuel pump, fuel filter, fuel injection system (if applicable), carburetor service (if applicable), fuel line maintenance
Battery:
Battery specifications, charging, maintenance, replacement
Maintenance:
Regular scheduled maintenance, oil changes, filter replacements, brake fluid flushes, coolant checks, tire pressure checks
Troubleshooting:
Diagnostic procedures for common and uncommon issues, fault codes (if applicable), step-by-step problem-solving guides
Repair:
Detailed instructions for component disassembly, inspection, repair, and reassembly across all vehicle systems
Installation:
Guidance on installing replacement parts and accessories
Adjustment:
Procedures for adjusting components like brakes, steering, and cables
Depth:
Comprehensive, covering everything from basic rider maintenance to complete engine rebuilds and advanced electrical diagnostics.
Engine Type:
Four-stroke, liquid-cooled, SOHC, 4-valve
Bore X Stroke:
Refer to manual for exact specifications (typically around 52mm x 58mm for 125cc)
Compression Ratio:
Refer to manual for exact specifications (typically around 11.0:1)
Fuel Delivery:
Fuel Injection (likely Mikuni or similar for this era)
Horsepower:
Approximately 11-12 HP (refer to manual for exact figures)
Torque:
Approximately 9-10 Nm (refer to manual for exact figures)
Fuel Type:
Unleaded gasoline (Octane rating as specified in manual)
Fuel Tank Capacity:
Approximately 12-14 liters (refer to manual for exact capacity)
Oil Change:
Typically every 3,000-5,000 km or annually (refer to manual for precise intervals and oil type).
Air Filter Inspection:
Check every 3,000-5,000 km, replace as needed.
Spark Plug Replacement:
Typically every 10,000-15,000 km.
Engine Oil Type:
Yamalube or equivalent high-quality motorcycle engine oil, viscosity (e.g., 10W-40) and API/JASO standards as specified in manual.
Brake Fluid Type:
DOT 4 recommended (refer to manual for specific Yamaha recommendations).
Coolant Type:
Ethylene glycol-based antifreeze, pre-mixed or concentrate, 50/50 with distilled water (refer to manual).
Common Wear Items:
Brake pads, tires, drive belt, and clutch wear are common maintenance items for scooters of this age.
Potential Electrical:
Wiring harness integrity and regulator/rectifier function can be points of inspection for scooters in this age range.