Segment:
Entry-level to intermediate off-road/trail riding motorcycle
Target Audience:
Beginner riders, trail enthusiasts, recreational riders
Competitors:
Honda CRF125F, Kawasaki KLX125L, Suzuki DR-Z125L
Engine Type:
Air-cooled, SOHC, four-stroke
Transmission Type:
5-speed constant mesh
Suspension Setup:
Telescopic front fork, Monocross rear suspension
Manual Title:
Yamaha TT-R125 Service Repair Manual
Applicable Models:
TT-R125W, TT-R125E, TT-R125LW, TT-R125LWE, TT-R125LEW
Manual Type:
Service and Repair Manual
Engine:
Complete engine disassembly, assembly, inspection, and repair
Fuel System:
Carburetor service, fuel tank, fuel pump (if applicable), fuel lines
Ignition System:
CDI unit, ignition coil, spark plug, wiring
Transmission:
Clutch operation, gearbox inspection, repair, and adjustment
Suspension:
Front fork service (including oil changes and seal replacement), rear shock absorber service
Brakes:
Front and rear brake system inspection, service, fluid replacement, pad/shoe replacement
Electrical System:
Wiring diagrams, lighting, charging system, battery, starter motor, switches
Cooling System:
Air-cooled engine specific considerations
Chassis:
Frame inspection, steering system, swingarm, drive chain
Bodywork:
Panel removal and installation, graphics, seat
Maintenance:
Regular maintenance procedures, lubrication, adjustments
Troubleshooting:
Diagnostic charts and common problem resolution guides
Repair:
Step-by-step repair instructions for all major components
Disassembly Assembly:
Detailed procedures for taking apart and putting back together vehicle systems
Wiring Diagrams:
Comprehensive electrical system wiring schematics
Torque Specifications:
Precise torque values for all critical fasteners
Depth:
Comprehensive, from basic adjustments to complete engine and transmission rebuilds
Diagnostic Capability:
Advanced diagnostic procedures for electrical and mechanical issues
Special Tools:
Identification and use of specialized tools required for certain procedures
Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve
Bore X Stroke:
54 mm x 54 mm
Carburetion:
Mikuni VM20SS (or similar, specific to model variant)
Horsepower:
Approximately 10-12 HP (estimated, varies by specific model variant and tuning)
Torque:
Approximately 7-8 lb-ft (estimated)
Fuel Tank Capacity:
Approx. 1.6 US gal (6.0 L)
Fuel Type:
Unleaded gasoline (87 octane or higher recommended)
Ignition System:
CDI (Capacitor Discharge Ignition)
Spark Plug Type:
NGK CR7E (or equivalent, check manual for exact fitment)
Transmission Type:
5-speed constant mesh
Clutch Type:
Wet, multiple disc
Gear Ratios:
Detailed in manual (specific ratios for each gear)
Transmission Oil Type:
Yamaha Yamalube 4 (or equivalent SAE 10W-40, API SG or higher)
Transmission Oil Capacity:
Approx. 0.85 L (0.9 US qt)
Length:
Varies by model variant (LW/LWE are longer wheelbase)
Width:
Varies by model variant
Height:
Varies by model variant
Wheelbase:
Standard: Approx. 50.4 in (1280 mm); LW/LWE: Approx. 51.4 in (1305 mm)
Dry Weight:
Approx. 185 lbs (84 kg) to 195 lbs (88.5 kg) depending on variant
Wet Weight:
Approx. 200 lbs (91 kg) to 210 lbs (95 kg) depending on variant
Max Load Capacity:
Not specified by manufacturer, consult manual for recommendations
Ground Clearance:
Approx. 11.6 in (295 mm) (standard models)
Crash Test Ratings:
N/A (Motorcycle)
Braking System:
Front disc brake, Rear drum brake
Lighting:
Headlight, taillight/brake light, turn signals (depending on street legality of variant)
Frame Construction:
Steel semi-double cradle frame
Ergonomics:
Designed for trail riding comfort and control
Oil Change Interval:
Every 1,000 km (600 miles) or 6 months (refer to manual for exact recommendation)
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on riding conditions
Spark Plug Replacement:
Every 6,000 km (3,600 miles) or as needed
Valve Clearance Check:
Every 6,000 km (3,600 miles) (critical for engine health)
Drive Chain Lubrication:
Every 200 km (125 miles) or after riding in wet conditions
Engine Oil:
Yamalube 4 (SAE 10W-40, API SG or higher)
Brake Fluid:
DOT 3 or DOT 4 non-silicone based hydraulic brake fluid
Fork Oil Type:
Yamaha Fork Oil G-10 or equivalent (SAE 10W)
Coolant:
N/A (Air-cooled engine)
Common Wear Items:
Clutch plates, chain and sprockets, brake pads, fork seals, carburetor jets
Carburetor Tuning:
Carburetors can be sensitive to altitude and temperature; requires proper jetting and adjustment
Suspension Wear:
Fork seals can leak over time, requiring replacement; rear shock may lose damping
Engine Decarbonization:
Periodic decarbonization of the combustion chamber may be beneficial for optimal performance
Brand Focus:
Yamaha is renowned for its performance motorcycles across various disciplines, including off-road
Predecessors:
TT-R125 line evolved from Yamaha's long history of trail bikes
Key Changes For 2006:
Minor updates may have occurred, specific details would be in the manual or factory bulletins
Manufacturing Origin:
Likely Japan or Southeast Asia (Yamaha production facilities)
Production Period:
TT-R125 series produced from early 2000s through mid-2010s
