Engine Mechanical:
Complete disassembly, inspection, repair, and reassembly of the engine.
Engine Fuel System:
Carburetor (or fuel injection system if applicable), fuel pump, fuel lines, fuel tank maintenance and repair.
Engine Ignition System:
Spark plug, ignition coil, CDI unit, wiring, timing adjustments.
Cooling System:
Radiator, coolant hoses, water pump, thermostat, bleeding procedures.
Lubrication System:
Oil pump, oil passages, oil filter, oil change procedures, oil specifications.
Exhaust System:
Exhaust manifold, muffler, catalytic converter (if applicable), repair and replacement.
Transmission Gearbox:
Gearbox disassembly, inspection, repair, clutch operation, gear shifting mechanisms.
Chassis Frame:
Frame inspection, alignment checks, modifications, repair.
Suspension Front:
Telescopic forks, steering head bearings, wheel bearings, fork oil changes, seal replacement.
Suspension Rear:
Shock absorber, swingarm, linkage system (if applicable), bush replacement, adjustments.
Brakes Front:
Brake caliper, master cylinder, brake lines, brake pads, brake discs, bleeding procedures, adjustments.
Brakes Rear:
Brake caliper, master cylinder, brake lines, brake pads, brake discs, bleeding procedures, adjustments.
Wheels Tires:
Wheel balancing, tire mounting and dismounting, tire pressure specifications.
Electrical System:
Battery, charging system (alternator/stator), lighting, horn, starter motor, fuses, relays.
Wiring Diagrams:
Detailed, high-quality wiring schematics for all electrical circuits.
Bodywork:
Fairings, seat, fuel tank, fenders, mounting points, cosmetic repairs.
Controls:
Throttle, clutch lever, brake lever, gear shift lever, footpegs, handlebar adjustments.
Disassembly Reassembly:
Step-by-step instructions for component removal and installation.
Maintenance:
Scheduled maintenance, inspections, cleaning, lubrication, adjustments.
Troubleshooting:
Diagnostic procedures for common problems, fault finding charts.
Repair:
Detailed instructions for repairing worn or damaged components.
Technical Diagnostics:
Procedures for diagnosing electrical and mechanical faults.
Component Testing:
Methods for testing the functionality of various components.
Depth:
Comprehensive from basic checks to complete engine and gearbox rebuilds.
Illustrations:
Numerous detailed illustrations, diagrams, and photographs.
Torque Specifications:
All critical torque values for fasteners are provided.
Clearances Tolerances:
Specified internal engine clearances and component tolerances.
Engine Type:
Liquid-cooled, 2-stroke, single-cylinder (typical for this era of GPR 125).
Displacement:
Approximately 125cc
Bore X Stroke:
Specifics available within the manual, typically around 54mm x 54.5mm.
Compression Ratio:
Specifics available within the manual, likely in the range of 8.5:1 to 10.5:1.
Horsepower:
Typically around 15 HP (11 kW) at around 9000 RPM, restricted by A1 license regulations.
Torque:
Specifics available within the manual, typically in the range of 12-14 Nm.
Fuel Delivery:
Carburetor (e.g., Dell'Orto PHBH 28 or similar), potentially with electronic injection on later models/specific markets.
Fuel Type:
Unleaded Petrol (Gasoline)
Oil System:
Separate oil injection system for 2-stroke oil (Autolube).
Oil Change Engine:
Specific interval for gearbox oil change (e.g., every 6,000 km or annually) and 2-stroke oil reservoir top-up. (Detailed schedule in manual).
Spark Plug Replacement:
Recommended replacement interval (e.g., every 5,000-7,500 km). Specific plug type (e.g., NGK BR9EG) and gap are provided.
Air Filter Cleaning:
Regular inspection and cleaning/replacement interval (e.g., every 3,000 km).
Chain Lubrication Adjustment:
Recommended interval for chain maintenance (e.g., every 500 km or after riding in wet conditions).
Engine Oil Type:
High-quality 2-stroke engine oil, specifically for Autolube systems. (Specific grade like API TC or JASO FD recommended).
Gearbox Oil Type:
Gearbox oil conforming to API GL-3 or GL-4, SAE 75W/90 or 10W/40. (Capacity and exact specification in manual).
Coolant Type:
Ethylene glycol-based antifreeze coolant, mixed with distilled water. (Specific ratio and type in manual).
Common Wear Items:
Clutch plates, spark plugs, piston rings, fork seals, chain and sprockets, brake pads.
Common Problems:
Carburetor tuning issues, electrical connectors corrosion, exhaust valve operation (if applicable), starter motor reliability.
