Engine:
Detailed breakdown, tuning, repair of the 125cc two-stroke engine.
Fuel System:
Carburetor settings, fuel pump, fuel lines, fuel tank inspection and repair.
Ignition System:
CDI unit, spark plug, ignition timing, coil inspection.
Cooling System:
Liquid cooling system components, radiator, coolant flow, thermostat.
Exhaust System:
Expansion chamber, silencer, gasket replacement, tuning considerations.
Transmission:
Gearbox operation, clutch assembly, gear selection mechanism, lubrication.
Frame And Suspension:
Chassis inspection, front forks (telescopic), rear shock absorber, swingarm, bearings.
Brakes:
Front and rear brake systems (likely hydraulic disc), master cylinder, calipers, brake pads, fluid lines, bleeding procedure.
Electrical System:
Wiring diagrams, battery, charging system (stator, regulator/rectifier), lighting, switches, starter motor.
Wheels And Tires:
Wheel bearing maintenance, tire pressure, replacement, rim specifications.
Bodywork And Fairings:
Removal and installation of body panels, seat, fuel tank, fairings.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug checks, lubrication points.
Troubleshooting:
Diagnostic flowcharts for common starting, running, and electrical issues.
Engine Rebuild:
Piston, cylinder, crankshaft, connecting rod, seals, and bearing replacement procedures.
Carburetor Overhaul:
Complete disassembly, cleaning, adjustment, and reassembly of the carburetor.
Clutch Adjustment And Replacement:
Procedure for adjusting clutch cable and replacing clutch plates.
Suspension Adjustment And Repair:
Fork oil change, fork seal replacement, rear shock adjustment.
Brake System Maintenance:
Brake pad replacement, caliper service, brake fluid flush and bleeding.
Electrical Diagnostics:
Testing of charging system, ignition components, and electrical circuits.
Wheel And Tire Service:
Bearing service, spoke tensioning (if applicable), tire mounting.
Depth Of Coverage:
Comprehensive, covering detailed repair and overhaul procedures for all major mechanical and electrical systems.
Diagnostic Capability:
Enables advanced diagnostics and troubleshooting for performance and reliability issues.
Engine Type:
Liquid-cooled, two-stroke, single-cylinder
Bore X Stroke:
56.0 mm x 50.6 mm (typical for this era, verify in manual)
Compression Ratio:
Approximately 7.2:1 (typical, verify in manual)
Horsepower Output:
Approx. 15-20 HP (depending on specific market and tuning, manual will provide precise figures)
Torque Output:
Specific figures vary, typically around 10-12 Nm (manual will detail)
Carburetor Type:
Single Mikuni VM28SS or similar (manual will specify exact model)
Fuel Delivery:
Gravity feed with reed valve induction
Oil Change Interval:
Typically every 2,000-3,000 km or annually (manual will provide specific interval).
Spark Plug Check:
Recommended at 1,000-2,000 km intervals (manual will specify).
Chain Adjustment:
Check and adjust chain slack every 500-1,000 km (manual will provide spec).
Engine Oil Type:
2-stroke premix oil (specific grade and ratio to be detailed in manual, e.g., SAE 10W-40 for gearbox, specific 2T oil for pre-mix).
Coolant Type:
Ethylene glycol based antifreeze mixture (manual will specify concentration).
Brake Fluid Type:
DOT 3 or DOT 4 (manual will specify exact requirement).
Common Wear Items:
Piston rings, exhaust gaskets, clutch plates, swingarm bearings, fork seals due to age and usage.
Electrical Reliability:
Aging wiring harnesses and electrical connectors can cause intermittent issues.
Carburetor Performance:
Carburetor jets can become clogged with age, affecting fuel delivery and performance.
