Market Segment:
Entry-level to intermediate off-road riding, youth and smaller adult riders.
Key Competitors:
Honda CRF125F, Kawasaki KLX125, Suzuki DR-Z125
Vehicle Key Features:
Lightweight, durable, easy to handle, electric start (E/LE models), reliable air-cooled engine.
Value For Buyers:
Provides dealership-level repair and maintenance information, empowering owners to perform their own servicing, reduce costs, and maximize vehicle lifespan.
Engine Coverage:
Complete Engine Overhaul, Reassembly, Tuning
Transmission Coverage:
Gearbox Disassembly, Inspection, and Reassembly
Chassis Coverage:
Frame, Suspension (Front & Rear), Steering System
Electrical System Coverage:
Ignition System, Lighting, Wiring Diagrams, Battery Maintenance
Fuel System Coverage:
Carburetor Service and Adjustment, Fuel Tank and Lines
Brake System Coverage:
Front and Rear Brake Service, Bleeding Procedures
Wheel And Tire Coverage:
Spoke Maintenance, Tire Changing, Wheel Balancing
Troubleshooting Coverage:
Diagnostic Flowcharts for Common Problems
Estimated Page Count:
300-500 Pages (typical for a comprehensive service manual)
Manual Type:
Combined Owner's and Motorcycle Service Repair Manual
Format:
Digital (likely PDF), Printable
Engine Systems:
Lubrication, Cooling (Air-Cooled), Fuel Delivery, Ignition, Exhaust
Transmission Systems:
Clutch Operation, Gear Shifting Mechanism, Final Drive (Chain)
Suspension Systems:
Telescopic Front Forks, Monoshock Rear Suspension, Linkage Systems
Electrical Systems:
Spark Plug, CDI Unit, Lighting Coils, Battery, Fuses
Routine Maintenance:
Oil Changes, Filter Replacements, Chain Adjustments, Valve Clearance Checks
Major Repairs:
Engine Rebuilds, Transmission Overhauls, Fork Seal Replacement, Carburetor Rebuild
Diagnostic Procedures:
Troubleshooting Engine Performance Issues, Electrical Fault Finding
Adjustment Procedures:
Carburetor Jetting, Clutch Lever Free Play, Throttle Cable Free Play
Depth:
Comprehensive - From basic owner checks to full engine and transmission rebuilds. Includes detailed torque specifications, tolerances, and assembly diagrams.
File Format Details:
Likely a searchable PDF with high-resolution images and diagrams.
Print Quality Recommendation:
High-resolution digital reproduction suitable for printing individual pages or the entire manual.
Binding Type For Printed:
Coil-bound or perfect-bound for lay-flat usability in a workshop environment.
Paper Type Recommendation:
Durable, coated paper to withstand grease and workshop conditions.
Engine Type:
Four-stroke, SOHC, Air-cooled
Bore X Stroke:
54 mm x 54.5 mm
Horsepower:
Approximately 10-12 HP (estimated, manufacturer not providing precise figures for this model)
Torque:
Approximately 7-8 lb-ft (estimated)
Carburetor Model:
Mikuni VM20SS
Fuel Type:
Unleaded Gasoline (Regular)
Fuel Tank Capacity:
1.6 US gal (6.0 L)
Oil Type:
Yamalube 4 or equivalent SAE 10W-30 API SE type SE, SF, SG, SH, SJ or higher
Oil Capacity:
0.95 L (1.0 US qt)
Safety Ratings:
Not applicable for motorcycles in the same manner as automobiles (e.g., NHTSA ratings).
Braking System:
Front: Drum brake; Rear: Drum brake (TT-R125E) / Rear: Disc brake (TT-R125LE)
Lighting System:
Headlight, Taillight/Brake Light, Turn Signals (may vary by region/model year)
Chassis Design:
Steel diamond frame for rigidity and impact resistance.
Ergonomics:
Designed for rider control and balance in off-road conditions.
Infotainment Features:
N/A (Basic off-road motorcycle, no infotainment system).
Driver Assistance Features:
N/A (Basic off-road motorcycle).
Connectivity Features:
N/A (Basic off-road motorcycle).
Engine Oil Change Interval:
Every 3,000 km (1,800 miles) or 6 months (refer to manual for specific conditions).
Air Filter Cleaning Interval:
Every 1,000 km (600 miles) or as needed based on riding conditions.
Spark Plug Replacement Interval:
Every 10,000 km (6,000 miles).
Valve Clearance Check Interval:
Every 6,000 km (3,600 miles) or 12 months.
Chain Adjustment Interval:
Every 1,000 km (600 miles) or as needed.
Engine Oil Specification Code:
Yamalube 4 or equivalent SAE 10W-30 API SE, SF, SG, SH, SJ or higher.
Transmission Oil Specification Code:
Yamalube Gear Oil or equivalent SAE 80 API GL-4.
Brake Fluid Type:
DOT 3 or DOT 4 (for disc brake models).
Common Wear Items:
Tires, brake pads, clutch plates, chain and sprockets, air filter. Regular maintenance is key to longevity.
Carburetor Tuning:
Carburetors can sometimes require cleaning or re-jetting due to fuel variations or buildup.
Electrical Component Reliability:
While generally reliable, older electrical components like CDI units or stators can fail over time. The manual will aid in diagnosis.
Brand Focus:
Yamaha has a long and successful history in motorcycle manufacturing, particularly in off-road and performance segments.
Tt R Series Lineage:
The TT-R series is Yamaha's line of recreational off-road motorcycles, known for their durability and user-friendliness. The 125cc models are popular for trail riding and introductory motocross.
Production Period:
The TT-R125 model line has been in production for many years, with the 2003 model representing a specific iteration.
Manufacturing Location:
Likely manufactured in Japan or other Yamaha global production facilities.
