Engine Mechanical:
Engine disassembly, assembly, top-end components (cylinder, piston, valves), bottom-end components (crankshaft, connecting rod), timing, lubrication system
Fuel System:
Fuel injection system (EFI), fuel pump, injectors, throttle body, fuel tank, lines, and filters
Ignition System:
ECU (Engine Control Unit), ignition coils, spark plugs, sensors (crankshaft position, etc.)
Exhaust System:
Exhaust manifold, catalytic converter (if applicable), muffler, oxygen sensors
Transmission Drivetrain:
Automatic transmission (CVT - Continuously Variable Transmission), clutch, drive belts, variator, torque converter, gearbox, final drive
Cooling System:
Radiator, coolant hoses, water pump, thermostat, fan (if equipped)
Electrical System:
Battery, charging system (stator, regulator/rectifier), starter motor, lighting (headlight, taillight, indicators), wiring diagrams, fuses, relays
Braking System:
Brake calipers, brake pads, brake discs/rotors, brake lines, master cylinder, brake fluid, parking brake (if applicable)
Suspension System:
Front forks (telescopic, hydraulic), rear shock absorber, linkage (if applicable)
Steering System:
Handlebars, steering column, bearings
Chassis Frame:
Frame construction, body panels, fairings, seat
Wheels Tires:
Wheel bearings, tire pressures, wheel removal/installation
Preventive Maintenance:
Oil changes, filter replacements (oil, air, fuel), spark plug inspection/replacement, brake fluid flush, coolant flush, drive belt inspection/replacement, valve clearance adjustment
Troubleshooting:
Diagnostic procedures for engine performance issues, electrical faults, starting problems, braking issues; symptom-based troubleshooting guides
Engine Repair:
Engine overhaul, cylinder head service, piston and ring replacement, crankshaft and bearing service, valve adjustments, timing chain replacement
Transmission Repair:
CVT system servicing, clutch weight adjustment, variator and torque converter replacement, gearbox disassembly and reassembly
Electrical Repair:
Wiring harness repair, component testing (stator, regulator, starter), battery service, lighting system diagnostics
Braking System Repair:
Brake pad and disc replacement, caliper servicing, master cylinder overhaul, brake line bleeding and replacement
Suspension Fork Repair:
Front fork seal replacement, fork oil change, fork overhaul
Bodywork Repair:
Fairing removal and installation, panel replacement, seat adjustment
Fluid Level Checks:
Engine oil level, coolant level, brake fluid level
Torque Specifications:
Torque values for critical fasteners (engine bolts, wheel nuts, brake caliper bolts, etc.)
Diagnostic Capability:
Advanced diagnostic procedures, including interpretation of fault codes (if OBD-II compatible or similar diagnostic port exists) and sensor data analysis
Repair Scope:
Comprehensive repair procedures, from routine maintenance to complete engine and transmission rebuilds, and chassis component overhaul
Special Tools Required:
Identification and usage of specialized tools and equipment necessary for specific repair or diagnostic tasks
Service Data:
Detailed specifications for clearances, measurements, pressures, and tolerances for all major components
Engine Type:
Four-stroke, single-cylinder, air-cooled (common for this class)
Displacement 125Cc:
Approximately 124cc (specific bore/stroke may vary)
Displacement 150Cc:
Approximately 149cc (specific bore/stroke may vary)
Valvetrain:
2-valve or 4-valve SOHC (Single Overhead Camshaft) depending on exact variant
Horsepower 125Cc:
Typically in the 10-12 HP range (actual figures vary by year and market)
Horsepower 150Cc:
Typically in the 12-15 HP range (actual figures vary by year and market)
Torque:
Torque figures are modest, suitable for urban acceleration (specific Nm values will be in the manual)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline (RON 91 or higher)
Cooling Method:
Air-cooled
Lubrication System:
Wet sump
Compression Ratio:
Variable by specific engine code, typically around 10:1 to 12:1
Engine Oil Change:
Typically every 5,000-7,500 km or annually (check manual for precise interval)
Oil Filter Replacement:
Usually replaced with engine oil changes or every other oil change
Air Filter Cleaning Replacement:
Inspect every 5,000 km, clean/replace as needed, typically every 10,000-15,000 km
Spark Plug Replacement:
Inspect every 10,000 km, replace as needed (specific plug type and gap in manual)
Drive Belt Inspection Replacement:
Inspect every 10,000 km, replace typically every 20,000 km or sooner if wear is evident
Valve Clearance Adjustment:
Typically at initial service (1,000 km) and then every 10,000-15,000 km (critical check for performance)
Brake Fluid Flush:
Every 2 years or as per manual recommendation
Engine Oil Type:
API SG or higher, SAE 10W-40 or 15W-40 (confirm specific viscosity range based on climate and manual recommendation)
Engine Oil Capacity:
Approx. 0.9 - 1.1 liters (check manual for exact figure)
Coolant Type:
Ethylene glycol based, antifreeze/coolant with corrosion inhibitors (typically green or blue color)
Common Wear Items:
Drive belt, brake pads, tires, suspension bushings, battery, starter motor brushes
Potential Engine Issues:
Valve seat wear over high mileage, occasional fuel injector clogging, CVT component wear (variator weights, clutch shoes)
Electrical Common Faults:
Faulty regulator/rectifier, weak stator output, wiring harness issues (corrosion/fraying in exposed areas)
