Target Audience:
Owners of the 1999 Yamaha TT-R125(M) seeking to perform maintenance, repairs, and diagnostics.
Value Proposition:
Provides professional-level repair information, replicating the resources used by Yamaha certified technicians.
Completeness:
Covers all aspects of vehicle maintenance and repair, from basic checks to complete overhauls.
Diagnostic Tools:
Includes essential diagnostic data and troubleshooting guides for efficient problem-solving.
Engine Service:
Complete engine disassembly, inspection, repair, and reassembly procedures for the TT-R125(M) engine.
Fuel System Service:
Carburetor tuning, cleaning, and overhaul; fuel tank and line inspection and maintenance.
Ignition System Service:
Spark plug diagnosis and replacement, ignition coil testing, CDI unit troubleshooting.
Cooling System Service:
Radiator inspection, coolant specifications, and maintenance for air-cooled systems.
Transmission Service:
Clutch operation, gear shifting mechanisms, and internal transmission component inspection and repair.
Suspension Service:
Front fork oil change, seal replacement, rear shock absorber adjustment and service.
Brake System Service:
Brake pad replacement, caliper inspection, brake fluid specifications, and bleeding procedures.
Electrical System Service:
Wiring diagrams, component testing (lights, horn, switches), battery maintenance, and charging system checks.
Chassis And Frame Service:
Frame inspection for damage, steering bearing maintenance, and swingarm service.
Wheel And Tire Service:
Tire pressure specifications, wheel bearing maintenance, spoke adjustment.
Routine Maintenance:
Detailed instructions for oil changes, filter replacements, spark plug checks, chain lubrication, and adjustments.
Troubleshooting Guides:
Systematic diagnostic procedures for common and uncommon issues with symptom-based troubleshooting charts.
Repair Procedures:
Step-by-step instructions for component repair, including torque specifications and special tool requirements.
Disassembly And Reassembly:
Comprehensive guides for taking apart and putting back together major vehicle systems.
Inspection And Adjustment:
Procedures for checking wear and tear, making necessary adjustments to maintain optimal performance.
Depth Level:
Comprehensive, suitable for professional technicians and advanced DIY enthusiasts.
Diagnostic Capability:
Includes detailed diagnostic flowcharts and electrical system testing procedures.
Rebuild Procedures:
Covers complete engine and transmission rebuilds with detailed component specifications.
Engine Type:
Four-stroke, SOHC, air-cooled
Bore X Stroke:
54.0 mm x 54.5 mm
Horsepower Est:
Approx. 10-12 HP (Varies by condition and tuning)
Torque Est:
Approx. 7-8 lb-ft (Varies by condition and tuning)
Carburetor Type:
Mikuni VM20SS (or similar)
Fuel Type:
Unleaded gasoline
Engine Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first. Consult manual for specific recommendations.
Air Filter Cleaning:
Every 1000 km (600 miles) or as needed based on riding conditions. More frequent cleaning in dusty environments.
Spark Plug Inspection:
Every 1000 km (600 miles) or as needed. Replacement based on condition.
Chain Maintenance:
Lubrication and tension adjustment every 500 km (300 miles) or after riding in wet conditions.
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 or 20W-40 API SE, SF, SG or SH type motor oil).
Engine Oil Capacity:
Approx. 0.95 L (0.84 Imp qt, 1.0 US qt) without filter change; Approx. 1.0 L (0.93 Imp qt, 1.1 US qt) with filter change. (Verify with manual).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Common Wear Items:
Clutch plates, brake pads, sprockets, chain, and tires are typical wear items subject to replacement based on usage.
Carburetor Tuning Sensitivity:
Carburetors on smaller displacement off-road bikes can be sensitive to altitude and temperature changes, requiring occasional adjustment.
Yamaha Legacy:
Yamaha has a long-standing reputation for producing reliable and performance-oriented motorcycles, particularly in the off-road segment.
Tt-R Lineage:
The TT-R line represents Yamaha's commitment to accessible and capable off-road machines for recreational riders and aspiring racers.
Production Period:
The TT-R125 was introduced to the market around the late 1990s and saw updates and variations in subsequent years.
