Engine Mechanical:
Complete engine disassembly, inspection, repair, and reassembly procedures for the TTR125's 124cc air-cooled four-stroke engine.
Engine Top End:
Cylinder head, valve train, camshaft, piston, cylinder, and related components.
Engine Bottom End:
Crankshaft, connecting rod, bearings, seals, and crankcase assembly.
Fuel Delivery:
Carburetor overhaul, adjustment, fuel tank, fuel lines, and fuel filter.
Ignition System:
CDI ignition system, stator, ignition coil, spark plug, and wiring.
Lubrication System:
Oil pump, oil filter, oil passages, and oil specifications.
Cooling System:
Air-cooled design, but includes procedures for ensuring proper airflow and engine temperature management.
Transmission And Drivetrain:
Gearbox overhaul, clutch operation and adjustment, chain and sprocket maintenance.
Suspension Front:
Telescopic front fork disassembly, seal replacement, oil levels, and adjustment.
Suspension Rear:
Monoshock rear suspension, linkage maintenance, shock absorber service, and adjustment.
Braking System Front:
Front disc brake caliper overhaul, hydraulic system bleeding, pad replacement, and rotor inspection.
Braking System Rear:
Rear drum brake inspection, adjustment, and shoe replacement (if applicable to specific TTR125 variants).
Wheels And Tires:
Wheel bearing maintenance, spoke tensioning, tire pressure recommendations, and tire replacement.
Electrical System Components:
Lighting system, battery maintenance, fuses, switches, and wiring diagrams.
Frame And Bodywork:
Frame inspection, plastics removal and installation, seat, fuel tank, and fender procedures.
Routine Maintenance:
Oil changes, air filter cleaning/replacement, spark plug checks, chain lubrication and adjustment, brake adjustments, and general inspections.
Troubleshooting Guides:
Diagnostic charts and procedures for identifying and resolving common mechanical and electrical issues.
Engine Rebuild:
Detailed step-by-step instructions for complete engine overhauls, including piston ring replacement, valve lapping, and bearing replacement.
Suspension Service:
Front fork seal replacement, rear shock absorber servicing, and linkage bearing lubrication.
Brake System Service:
Brake fluid bleeding, pad/shoe replacement, caliper/drum servicing, and lever/pedal adjustments.
Carburetor Tuning:
Jetting adjustments, idle speed setting, and carburetor cleaning procedures for optimal performance.
Electrical Diagnostics:
Troubleshooting electrical faults using wiring diagrams and diagnostic steps.
Clutch Adjustment And Repair:
Cable adjustment and clutch pack inspection/replacement.
Wheel Truing:
Spoke tensioning and wheel alignment procedures.
Depth:
Comprehensive; covers everything from basic maintenance to complete engine and chassis rebuilds.
Diagnostic Capability:
High; includes detailed troubleshooting sections to identify root causes of issues.
Diagrams And Illustrations:
Extensive; typically includes detailed exploded views, wiring diagrams, and step-by-step illustrations.
Oil Change:
Typically every 1000-1500 km or 6-12 months. Refer to manual for precise interval and severe use recommendations.
Air Filter Cleaning:
Recommended every few rides or monthly, depending on operating conditions. Manual details cleaning/replacement.
Spark Plug Check:
Inspect at regular intervals, replace as needed. Manual provides gap specifications and replacement procedures.
Chain Maintenance:
Lubricate and adjust chain tension every 500 km or as needed. Manual provides tension specifications.
Engine Oil:
Yamaha recommends Yamalube or equivalent SAE 10W-40 API SG or higher. Manual lists exact specifications and capacity.
Fork Oil:
Specific viscosity and quantity required for front forks. Manual will specify (e.g., SAE 10W).
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid. Manual specifies type and bleeding procedure.
Carburetor Clogging:
Common on older bikes if fuel sits, leading to starting issues or poor running. Manual covers cleaning and rebuild.
Suspension Seal Leaks:
Front fork seals can degrade over time, leading to oil leaks. Manual details seal replacement.
Clutch Cable Adjustment:
May require periodic adjustment for optimal clutch engagement. Manual provides adjustment procedure.
Chain Wear:
Regular lubrication and adjustment extends chain life. Manual outlines wear checks.