Target Audience:
Entry-level to intermediate off-road riders, recreational trail riders, youth riders.
Key Competitors:
Honda CRF100F/150F, Kawasaki KLX110/125, Suzuki DR-Z125.
Vehicle Philosophy:
User-friendly, reliable, and capable trail bike with an emphasis on ease of use and maintenance.
Manual Benefit:
Empowers owners to perform routine maintenance, diagnose issues, and carry out repairs, saving time and money.
Engine System:
Complete engine disassembly, assembly, diagnosis, and tuning.
Transmission System:
Clutch, gearbox, and final drive maintenance and repair.
Fuel System:
Carburetor service, cleaning, adjustment, and fuel tank/lines.
Ignition System:
CDI, spark plug, and related components.
Electrical System:
Lighting, charging system (stator, regulator/rectifier), battery, wiring diagrams.
Suspension System:
Front forks (telescopic) and rear shock absorber service, adjustment, and replacement.
Brake System:
Front and rear drum brake service, adjustment, and inspection.
Wheel And Tire System:
Wheel bearing service, tire pressure, and replacement.
Chassis And Frame:
Frame inspection, steering head bearing service.
Cooling System:
Air-cooled engine.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, brake adjustment, spark plug inspection/replacement.
Troubleshooting Diagnostics:
Step-by-step diagnostic procedures for common issues.
Engine Repair:
Top-end rebuilds, valve adjustments, piston replacement, crankshaft inspection.
Carburetor Rebuild:
Complete carburetor cleaning, reassembly, and jetting adjustments.
Electrical Component Testing:
Testing stator output, CDI unit, and lighting circuits.
Suspension Overhaul:
Fork seal replacement, damper rod service, shock absorber repair.
Brake System Overhaul:
Brake shoe replacement and drum cleaning.
Wiring Diagrams:
Detailed electrical schematics for easy troubleshooting.
Depth Level:
Detailed rebuild and repair procedures, suitable for home mechanics and professional technicians.
PDF Quality:
High resolution, searchable text, printable pages (if digital).
Print Quality:
Clear, legible text and diagrams; durable paper stock (if printed).
Binding Type:
Perfect bound or spiral bound for lay-flat usability (typical for service manuals).
Paper Type:
Durable, oil-resistant paper (if printed).
Engine Type:
4-stroke, SOHC, 2-valve, air-cooled single-cylinder
Displacement:
124 cc (Cubic Centimeters)
Bore X Stroke:
54.0 mm x 54.5 mm (approximate)
Compression Ratio:
9.5:1 (typical for this era)
Horsepower:
Approximately 9-10 HP @ 7500 RPM (estimated)
Torque:
Approximately 7-8 lb-ft @ 6000 RPM (estimated)
Carburetor Type:
Mikuni VM20 (typical)
Fuel Type:
Unleaded gasoline
Fuel Capacity:
Approximately 1.1 US gallons (4.2 L)
Overall Length:
Approximately 71.7 inches (1820 mm)
Overall Width:
Approximately 31.5 inches (800 mm)
Overall Height:
Approximately 42.9 inches (1090 mm)
Wheelbase:
Approximately 49.2 inches (1250 mm)
Ground Clearance:
Approximately 11.0 inches (280 mm)
Dry Weight:
Approximately 163 lbs (74 kg)
Wet Weight:
Approximately 174 lbs (79 kg) (with fluids, estimated)
Seat Height:
Approximately 30.9 inches (785 mm)
Crash Safety Rating:
N/A (Motorcycle safety ratings differ from automotive)
Braking System:
Front and rear drum brakes.
Suspension Stability:
Telescopic front forks and single rear shock provide stability.
Lighting System:
Headlight, taillight, stop light, turn signals (depending on sub-model/region).
Engine Oil Change:
Every 600 miles (1000 km) or 6 months, whichever comes first.
Spark Plug Inspection:
Every 1200 miles (2000 km) or annually.
Air Filter Cleaning:
Every 600 miles (1000 km) or as needed in dusty conditions.
Chain Lubrication Adjustment:
Every 300 miles (500 km) and after washing or riding in the rain.
Valve Clearance Check:
Every 2400 miles (4000 km).
Engine Oil Type:
Yamaha Yamalube 4 10W-30 or equivalent API SG or higher, JASO MA compliant motorcycle oil.
Engine Oil Capacity:
0.90 L (0.95 US qt) without filter change; 1.00 L (1.06 US qt) with filter change.
Transmission Oil Type:
Same as engine oil.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (for any potential hydraulic applications if present, though typically drum brakes use mineral oil or are dry).
Common Wear Items:
Brake shoes, chain and sprockets, tires, air filter, spark plug.
Carburetor Cleaning:
Regular cleaning may be required due to fuel quality or debris ingress.
Suspension Seals:
Front fork seals can wear over time, leading to leaks.
Clutch Adjustment:
Clutch lever play may require periodic adjustment.
Yamaha Legacy:
Yamaha Motor Company is a Japanese manufacturer renowned for its high-quality motorcycles, sporting heritage, and innovation.
Ttr Lineage:
The TTR line is Yamaha's series of recreational off-road motorcycles, known for their reliability and ease of use. The TTR125 was introduced to bridge the gap between smaller trail bikes and more performance-oriented models.
2002 Model Year Significance:
Represents the early iteration of the TTR125, offering a solid platform for trail riding and learning off-road techniques.
Manufacturing Location:
Japan (primary)
