Category:
Entry-level to intermediate off-road motorcycle.
Target Audience:
Beginner riders, youth riders, trail riding enthusiasts.
Competitors:
Honda CRF150F, Kawasaki KLX125, Suzuki DR-Z125.
Design Philosophy:
Reliability, ease of use, accessible performance for trail riding.
Model Variants:
TTR125 (standard), TTR125E (electric start), TTR125LE (long-travel suspension, electric start).
Purpose:
To provide owners and technicians with the necessary information to maintain, diagnose, and repair the Yamaha TTR125.
Primary Coverage:
Comprehensive service and repair for Yamaha TTR125 models.
Secondary Coverage:
Maintenance, troubleshooting, specifications, diagnostics.
Type:
Service and Repair Manual
Format:
Digital Download (PDF)
Engine:
Detailed breakdown of engine components, rebuild procedures, valve adjustments, timing, carburetor overhaul, ignition system.
Control System:
Throttle controls, clutch assembly, brake levers, shift lever operation, cable routing and adjustment.
Mechanical:
Chassis, suspension (front forks and rear shock), steering, frame, swingarm, bearings, wheel assembly, chain drive.
Fuel System:
Fuel tank, fuel petcock, carburetor (Mikuni VM series typically), fuel lines, fuel filter.
Electrical System:
Wiring diagrams, lighting system (headlight, taillight, brake light), ignition coil, spark plug, battery, charging system (if applicable).
Brakes:
Front and rear brake systems (drum or disc depending on variant), brake pad replacement, fluid bleeding, caliper service.
Bodywork:
Fairings, fenders, seat, fuel tank cover, removal and installation procedures.
Maintenance:
Regular service checks, oil changes, air filter cleaning/replacement, chain lubrication and adjustment, spark plug inspection.
Repair:
Engine disassembly and reassembly, transmission servicing, carburetor tuning and repair, suspension overhaul, brake caliper service, wheel bearing replacement.
Troubleshooting:
Diagnostic charts for common problems related to starting, running, electrical issues, and component failures.
Diagnostics:
Guidance on identifying and resolving performance issues, engine noise, and system malfunctions.
Depth:
Comprehensive from basic maintenance to complete engine and transmission rebuilds.
Diagnostic Detail:
Includes detailed troubleshooting flowcharts and symptom-based diagnostics.
Schematics:
Detailed wiring diagrams and exploded views of major assemblies.
Engine Type:
Four-stroke, SOHC, air-cooled
Displacement:
124 cc (7.58 cubic inches)
Bore X Stroke:
54 mm x 54.5 mm
Compression Ratio:
9.5:1 (typical)
Carburetor:
Mikuni VM20 (typically)
Horsepower:
Approximately 9-10 HP (at crankshaft, estimated)
Torque:
Not officially specified, but designed for low-end grunt.
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
1.6 US gallons (6.0 L)
Fuel Delivery:
Carburetor
Oil Change:
Every 1,000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on conditions.
Spark Plug Inspection:
Every 1,000 km (600 miles)
Valve Clearance Check:
Every 6,000 km (3,700 miles) or annually.
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-40, API SG or higher, JASO MA)
Engine Oil Capacity:
0.90 L (0.95 US qt) without filter change, 1.00 L (1.06 US qt) with filter change.
Brake Fluid Type:
DOT 3 or DOT 4 (as specified in manual for drum/disc)
Chain Lube:
Recommended motorcycle chain lubricant.
Carburetor Clogging:
Common with infrequent use or stale fuel, requires cleaning/rebuilding.
Clutch Slipping:
Can occur with heavy use or worn clutch plates; check adjustment and wear.
Suspension Seals:
Front fork seals can degrade over time, leading to leaks.
Electrical Connections:
Corrosion can affect connections, especially in humid or dirty environments.
Yamaha Motorcycles:
Yamaha Motor Corporation is a Japanese manufacturer known for its high-quality motorcycles, musical instruments, and marine products.
Ttr Series:
The TTR series was introduced to provide reliable and easy-to-ride off-road motorcycles. The TTR125 was a significant model in this line, popular for its user-friendly nature.
2004 Updates:
While major redesigns were infrequent for this generation, minor refinements or graphics updates may have occurred. The core platform remained consistent.
Manufacturing Location:
Japan and/or other Yamaha production facilities.
