Engine Mechanical:
Complete engine overhaul, disassembly, assembly, tuning, specifications, and troubleshooting for the 125cc two-stroke engine.
Fuel System:
Carburetor tuning, jetting, maintenance, fuel pump (if applicable), fuel lines, and tank.
Ignition System:
CDI ignition, spark plug selection, testing, timing adjustments.
Cooling System:
Radiator, coolant, fan (if applicable), water pump maintenance and troubleshooting.
Exhaust System:
Pipe inspection, repair, and re-installation.
Transmission And Drivetrain:
Clutch operation, adjustment, and overhaul; gearbox disassembly, assembly, inspection, and lubrication; chain and sprocket maintenance.
Suspension Front:
Fork service, oil changes, seal replacement, damping adjustments, spring preload (if applicable).
Suspension Rear:
Shock absorber service, linkage maintenance, bearing inspection and replacement, spring adjustments.
Brakes Front:
Hydraulic brake system, caliper service, pad replacement, fluid bleeding, master cylinder overhaul, rotor inspection.
Brakes Rear:
Hydraulic brake system, caliper service, pad replacement, fluid bleeding, master cylinder overhaul, rotor inspection.
Wheels And Tires:
Spoke tensioning, rim inspection, tire selection and mounting, wheel bearing maintenance.
Steering:
Handlebar replacement, steering stem bearings maintenance and adjustment, control cable routing.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, fuse identification and replacement, basic troubleshooting.
Bodywork And Chassis:
Frame inspection, plastic component removal and installation, seat maintenance, graphics application.
Routine Maintenance:
Oil changes (transmission, pre-mix), filter cleaning/replacement, chain lubrication and adjustment, bolt torquing, spark plug checks.
Disassembly Assembly:
Detailed step-by-step instructions for major component removal and re-installation, aided by exploded views.
Troubleshooting:
Diagnostic procedures for common issues, fault finding guides for engine, electrical, and chassis problems.
Rebuilds Overhauls:
Comprehensive guidance for complete engine rebuilds, gearbox overhauls, and suspension component refreshes.
Adjustments:
Accurate procedures for clutch, throttle, brakes, suspension, and carburetor adjustments.
Lubrication:
Specific lubrication points and recommended lubricant types and intervals.
Component Inspection:
Detailed guidelines for inspecting wear and tear on critical components.
Depth:
Expert level, covering complete engine rebuilds, advanced diagnostics, and detailed technical specifications for all major systems.
Diagrams Illustrations:
Includes exploded views and detailed diagrams for easy identification and correct re-assembly.
Step By Step Instructions:
Clear, sequential instructions for all repair and maintenance procedures.
Type:
125cc Liquid-Cooled, Two-Stroke, Single-Cylinder
Bore X Stroke:
Typically 54mm x 54.5mm (refer to manual for exact figures)
Reed Valve System:
Yes, typically featuring a case-reed induction system.
Power Output:
Approx. 35-40 HP (specific output varies by model and tuning, refer to manual for exact figures)
Torque:
Refer to manual for specific torque figures.
Performance Enhancements:
Manual covers tuning, jetting, and modifications for optimal performance.
Carburetor:
Likely Keihin PWK or similar 38mm carburetor. Manual provides detailed jetting and tuning guidance.
Fuel Type:
Unleaded gasoline with proper two-stroke oil pre-mix ratio (refer to manual for specific ratio, typically 40:1 or 50:1).
Engine Top End Rebuild:
Recommended every 50-100 hours of riding, depending on riding style and conditions. Manual provides detailed inspection points.
Transmission Oil Change:
Every 20-30 hours of riding, or as per manual recommendations. Cleanliness is paramount.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions. Manual details cleaning and oiling procedures.
Spark Plug Check:
Every 10-15 hours of riding. Manual provides gap specifications and replacement guidelines.
Transmission Oil:
SAE 80 or SAE 85W gear oil. Specific viscosity and API classification detailed in manual.
Coolant:
Ethylene glycol-based coolant mixed with distilled water (typically 50/50). Manual specifies type and capacity.
Brake Fluid:
DOT 4 hydraulic brake fluid. Manual specifies type and bleeding procedures.
Pre Mix Oil:
High-quality JASO FD or API TC certified two-stroke oil. Manual recommends specific types and pre-mix ratios (e.g., 40:1, 50:1).
Typical Wear Items:
Piston rings, clutch plates, wheel bearings, steering head bearings, fork seals, and suspension linkage bearings are common wear items requiring periodic inspection and replacement.
Carburetor Tuning:
Carburation can be sensitive to altitude, temperature, and modifications. Manual provides extensive jetting charts and tuning advice.
Cooling System Efficiency:
Proper coolant level and radiator cleanliness are crucial for preventing overheating, especially under strenuous riding conditions.
