Vehicle Segment:
Lightweight, entry-level motorcycle, often used for commuting, light off-road, or as a beginner's machine.
Competitors:
Competes with similar displacement models from manufacturers like Honda (e.g., XR125L), Yamaha (e.g., XT125R/X), Suzuki (e.g., DR125), and Kawasaki (e.g., KLX125).
Design Philosophy:
Focuses on simplicity, reliability, and affordability, often with dual-sport or trail-oriented styling.
Engine:
Detailed disassembly, assembly, diagnosis, and repair procedures for the 125cc engine. Includes valve adjustments, piston and cylinder inspection, crankshaft and connecting rod service.
Fuel System:
Carburetor overhaul, adjustment, and troubleshooting. Fuel pump and filter inspection (if applicable).
Ignition System:
Spark plug specifications, ignition timing, CDI unit testing, and stator coil diagnostics.
Transmission:
Clutch operation and adjustment, gearbox disassembly and assembly, gear inspection, and lubricant specifications.
Drivetrain:
Chain and sprocket inspection, adjustment, and replacement. Rear wheel hub and bearing service.
Brakes:
Front and rear brake system maintenance, including caliper overhaul, pad replacement, fluid bleeding, and master cylinder service. Disc and drum brake specifications.
Suspension:
Front fork disassembly, seal replacement, oil level and specification. Rear shock absorber inspection and adjustment.
Wheels And Tires:
Tire pressure specifications, wheel bearing service, and spoke tensioning (if applicable).
Electrical System:
Wiring diagrams, battery maintenance and testing, charging system (stator, rectifier/regulator), lighting system diagnostics, starter motor operation, and fuse box layout.
Cooling System:
If air-cooled, emphasis on airflow and cleaning. If liquid-cooled, coolant specifications, bleeding procedures, and radiator inspection.
Frame And Bodywork:
Frame inspection, fairing removal and installation, seat and tank mounting, and general body panel repair.
Routine Maintenance:
Oil changes, filter replacements, chain adjustments, brake checks, and general inspections.
Troubleshooting:
Systematic diagnostic flowcharts for common starting, running, and electrical issues.
Major Repairs:
Engine rebuilds, transmission overhauls, suspension repairs, and electrical component replacement.
Component Disassembly Assembly:
Step-by-step instructions with torque specifications for all major components.
Specifications Data:
Torque values, clearances, fluid capacities, and electrical resistance readings.
Diagnostic Capabilities:
Covers basic to advanced diagnostic procedures, including electrical testing with multimeters and visual inspection techniques.
Rebuild Level:
Suitable for complete engine and component rebuilds, providing all necessary internal specifications and assembly sequences.
Electrical Diagrams:
Detailed, high-resolution wiring diagrams essential for diagnosing electrical faults.
File Type:
Portable Document Format (PDF)
Printability:
High Quality, Fully Printable. Allows for easy printing of individual pages or sections.
Binding Style Recommendation:
Digital download, can be printed and bound as a comb-bind or spiral-bound document for workshop use.
Recommended Paper For Printing:
Standard printer paper (80gsm or higher recommended for durability).
Engine Type:
Single-cylinder, 4-stroke, SOHC
Displacement:
Approximately 124cc (actual displacement may vary slightly by year/variant)
Bore X Stroke:
Typical for this class, e.g., 56.5mm x 49.5mm (refer to manual for precise figures).
Cooling System:
Air-cooled
Horsepower:
Estimated 9-12 HP (at crank, varies by emissions standards and tuning).
Torque:
Estimated 8-10 Nm (at crank, varies).
Fuel Delivery:
Carburetor
Carburetor Type:
Typically a Mikuni or Keihin constant velocity (CV) or slide type carburetor, e.g., VM26 or similar.
Fuel Type:
Unleaded Gasoline (RON 91/95 equivalent)
Oil Change Interval:
Typically every 3,000-5,000 km or annually, whichever comes first. Refer to manual for precise mileage and time intervals.
Valve Clearance Check:
Recommended at 6,000-10,000 km or as specified in the manual.
Spark Plug Replacement:
Recommended every 10,000-12,000 km, depending on plug type.
Engine Oil Type:
API SG, SF, or SH classification, SAE 10W-40 or 20W-50 motorcycle-specific oil recommended. Refer to manual for exact viscosity and API rating.
Engine Oil Capacity:
Approximately 1.0 - 1.2 Liters (without filter change), 1.2 - 1.4 Liters (with filter change). Refer to manual for exact capacity.
Brake Fluid Type:
DOT 3 or DOT 4 standard (depending on system specification, check brake reservoir cap).
Gearbox Oil Type:
Refer to manual; often same as engine oil or a specific gear oil for transmission components.
Carburetor Tuning:
Can be sensitive to altitude and humidity; requires periodic cleaning and adjustment for optimal performance.
Electrical Connections:
As with many bikes of this era, corrosion on electrical connectors can lead to intermittent faults; regular inspection and cleaning are advisable.
Chain Wear:
Regular lubrication and tension adjustment are crucial to prevent premature wear of the chain and sprockets.
