Target Audience:
Entry-level to intermediate off-road riders, recreational trail riders, and motocross enthusiasts.
Segment:
Lightweight off-road motorcycle.
Key Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX110/KLX125, Suzuki DR-Z125.
Design Philosophy:
User-friendly, reliable, and capable trail bike that is easy to maintain and operate.
Versatility:
Suitable for trail riding, recreational motocross, and learning basic off-road techniques.
Engine:
Complete overhaul, diagnostics, fuel system (carburetor), ignition system, lubrication, cooling (air-cooled), exhaust system.
Transmission:
Clutch operation and adjustment, gearbox internal inspection and repair, shift mechanism.
Chassis:
Frame, suspension (front forks, rear shock absorber), steering system, wheel bearings, swingarm.
Brakes:
Front and rear brake system maintenance, adjustment, component replacement (pads, shoes, cables, levers).
Electrical:
Wiring diagrams, lighting system, battery maintenance, ignition coil, CDI unit, starter system (for electric start models), troubleshooting.
Fuel System:
Carburetor disassembly, cleaning, adjustment, jetting information, fuel tank, fuel petcock.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks/replacement, chain adjustment, tire pressure checks, brake adjustments.
Troubleshooting:
Step-by-step diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides.
Repair And Overhaul:
Detailed instructions for engine disassembly/reassembly, carburetor rebuild, suspension fork service, brake caliper overhaul, clutch replacement.
Specifications And Measurements:
Torque specifications for all fasteners, valve clearances, piston ring gap, bore and stroke, electrical resistance values.
Depth Of Coverage:
Comprehensive, suitable for both DIY enthusiasts and professional mechanics. Covers basic maintenance through complete engine and chassis rebuilds.
Diagnostic Capabilities:
Includes information on diagnosing ignition system faults, carburetor performance issues, and mechanical wear.
Digital Format:
PDF (Portable Document Format)
Searchability:
Typically text-searchable within the PDF for quick access to specific topics.
Resolution:
High-resolution scans or digital-native files, suitable for printing.
Physical Manual Binding:
Not applicable for digital format; if printed, likely a professional comb or spiral binding for lay-flat use.
Physical Manual Paper:
Not applicable for digital format; if printed, typically on durable, matte paper to reduce glare in a workshop.
Engine Type:
4-stroke, SOHC, Air-cooled
Bore X Stroke:
54 mm x 54 mm (typical)
Compression Ratio:
9.5:1 (typical)
Valvetrain:
SOHC, 2 valves
Horsepower Estimated:
Approx. 10-12 HP (specific figures vary)
Torque Estimated:
Approx. 7-8 lb-ft (specific figures vary)
Carburetor Model:
Mikuni VM20 (typical)
Fuel Type:
Unleaded gasoline, 87 octane (minimum)
Fuel Tank Capacity:
1.6 Gallons (6.0 Liters)
Oil Type:
SAE 10W-40 API SG or higher
Oil Capacity:
Approx. 0.8 Quarts (0.75 Liters)
Overall Length:
Approx. 71.1 inches (1805 mm)
Overall Width:
Approx. 31.1 inches (790 mm)
Overall Height:
Approx. 42.1 inches (1070 mm)
Seat Height:
Approx. 30.1 inches (765 mm)
Ground Clearance:
Approx. 10.0 inches (255 mm)
Dry Weight:
Approx. 167 lbs (76 kg) (Electric Start Model)
Wet Weight:
Approx. 181 lbs (82 kg) (Electric Start Model, with fluids)
Weight Distribution:
Typically 45% front, 55% rear (rider dependent)
Crash Test Ratings:
Not applicable for off-road motorcycles in the same manner as passenger vehicles.
Braking System:
Front: Drum brake; Rear: Drum brake. Manual details adjustment and maintenance.
Suspension Damping:
Provides stability and control over varied terrain.
Frame Construction:
Steel semi-double cradle frame for rider support and stability.
Ergonomics:
Designed for rider comfort and control during off-road riding.
Engine Oil Change:
Every 600 miles (1,000 km) or 6 months, whichever comes first.
Oil Filter Replacement:
Recommended at every oil change (internal oil screen).
Air Filter Cleaning:
Every 10-15 hours of riding or monthly.
Spark Plug Check:
Every 300 miles (500 km).
Chain Lubrication And Adjustment:
Every 200 miles (300 km) or after washing/heavy riding.
Valve Clearance Check:
Every 1,200 miles (2,000 km).
Engine Oil Specification:
Yamalube 4 (or equivalent) SAE 10W-40 API SG, JASO MA.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (for hydraulic systems, if applicable, though TTR125 is typically drum/cable).
Carburetor Clogging:
Common in carbureted engines with infrequent use or poor fuel quality, leading to hard starting or poor running.
Chain And Sprocket Wear:
Regular maintenance is crucial to prevent premature wear, especially under off-road conditions.
Suspension Seals:
Fork seal leaks can occur with heavy use; regular inspection and potential seal replacement are recommended.
Yamaha Legacy:
Yamaha is renowned for its long history of producing high-quality motorcycles, particularly in the off-road and performance segments, with a strong emphasis on engineering and rider experience.
Ttr Series Origin:
The TTR line was developed to offer accessible and user-friendly off-road performance, evolving from earlier Yamaha trail bikes.
Ttr125 Introduction:
The TTR125 was introduced to fill the niche for a lightweight, versatile 125cc off-road bike suitable for a wide range of riders.
2004 Updates:
While major redesigns occur less frequently in this segment, minor updates for 2004 would typically involve graphics, color schemes, and potentially minor adjustments to suspension or carburetor tuning based on rider feedback.
Manufacturing Location:
Typically manufactured in Japan or at Yamaha's international production facilities.
Industry Awards:
While specific awards for the 2004 model year are not widely documented, the TTR125 series has consistently been recognized by enthusiasts and publications for its value, reliability, and suitability as a learning platform.
Consumer Satisfaction:
Generally high consumer satisfaction due to its simplicity, durability, and forgiving nature.
