Segment:
Entry-level/intermediate off-road (trail bike/play bike).
Target Audience:
Beginner to intermediate riders seeking a reliable, user-friendly, and capable off-road motorcycle.
Key Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX125/KLX140, Suzuki DR-Z125.
Reliability:
Yamaha's reputation for robust and dependable powertrains.
User Friendliness:
Easy to start, handle, and maintain, suitable for developing riders.
Off Road Capability:
Designed for trails, dirt tracks, and recreational riding.
Engine Service:
Complete overhaul, tuning, troubleshooting, disassembly and reassembly of all engine components.
Transmission Service:
Clutch operation, gear shifting mechanism, transmission disassembly and reassembly.
Chassis Service:
Suspension (front and rear), steering, frame, wheels, tires, brakes, and final drive.
Electrical System:
Ignition system, lighting, charging system, wiring diagrams, component testing.
Fuel System:
Carburetor adjustment and overhaul, fuel tank, fuel lines.
Bodywork And Plastics:
Removal, installation, and maintenance of body panels and plastics.
Troubleshooting:
Systematic diagnostic procedures for common problems.
Estimated Pages:
Approximately 300+
Type:
Factory Service Manual / Repair Manual
Engine:
Full coverage: 124cc SOHC 2-valve air-cooled engine.
Transmission:
5-speed constant mesh transmission.
Suspension:
Front: Telescopic fork; Rear: Swingarm with Monoshock.
Brakes:
Front: Drum brake; Rear: Drum brake.
Electrical:
CDI ignition, magneto generator, basic lighting system.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug inspection/replacement, brake adjustment.
Engine Repair:
Top-end rebuild (cylinder, piston, rings), valve clearance adjustment, camshaft inspection, carburetor overhaul.
Transmission Repair:
Clutch replacement, gear inspection, shift drum and fork alignment.
Suspension Service:
Fork oil change, seal replacement, shock absorber inspection and replacement.
Brake Service:
Brake shoe inspection and replacement, brake cable adjustment.
Electrical Troubleshooting:
Wiring diagram interpretation, component testing (stator, CDI unit, lighting coils).
Depth:
Comprehensive: Covers everything from basic owner maintenance to full engine and chassis overhauls, including detailed diagnostic procedures.
Quality:
High-quality paper stock with durable binding, designed for workshop use.
Binding:
Stapled or perfect bound, designed to lay flat for easy reference.
Paper Quality:
Durable, smudge-resistant paper suitable for workshop environments.
Engine Type:
Air-cooled, four-stroke, SOHC, 2-valve
Bore X Stroke:
54 mm x 54 mm (approximate, refer to manual for exact spec)
Compression Ratio:
9.5:1 (approximate, refer to manual for exact spec)
Horsepower:
Approximately 10-12 HP (est. peak power, refer to manual for exact spec)
Torque:
Approximately 7-8 lb-ft (est. peak torque, refer to manual for exact spec)
Carburetor:
Mikuni VM20SS (or similar 20mm carburetor)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
1.6 US gallons (approximate)
Ignition System:
Digital CDI (Capacitor Discharge Ignition)
Spark Plug:
NGK CR7HSA or equivalent (refer to manual for exact spec and gap)
Oil Type:
SAE 10W-40 motorcycle oil, API SG or higher (refer to manual for exact spec)
Oil Capacity:
0.85 L (without filter change), 0.95 L (with filter change) (approximate, refer to manual for exact spec)
Length:
Approx. 70.7 inches (1795 mm)
Width:
Approx. 31.3 inches (795 mm)
Height:
Approx. 42.7 inches (1085 mm)
Wheelbase:
Approx. 49.2 inches (1250 mm)
Ground Clearance:
Approx. 11.0 inches (279 mm)
Dry Weight:
Approx. 185 lbs (84 kg)
Wet Weight:
Approx. 200 lbs (91 kg) (est. with fluids)
Front Suspension Travel:
Approx. 6.5 inches (165 mm)
Rear Suspension Travel:
Approx. 6.7 inches (170 mm)
Front Tire:
2.50-17 4PR (or similar, refer to manual for exact spec)
Rear Tire:
3.00-14 6PR (or similar, refer to manual for exact spec)
Front Wheel Size:
17 inch
Safety Certification:
Not applicable (off-road motorcycle, not street legal in most configurations)
Braking System:
Drum brakes front and rear, designed for controlled stopping in off-road conditions.
Frame Construction:
Durable steel frame designed to withstand off-road stresses.
Handguards:
Often included or an available accessory to protect hands from debris.
Engine Oil Change:
Every 1000 km or 6 months, whichever comes first (refer to manual for exact specification).
Air Filter Cleaning:
Every 500 km or as needed, depending on riding conditions (refer to manual).
Spark Plug Inspection:
Every 1000 km or 12 months (refer to manual).
Valve Clearance Check:
Every 6000 km or 24 months (refer to manual for specific interval and procedure).
Chain Lubrication And Adjustment:
Every 500 km or after riding in wet conditions.
Engine Oil:
SAE 10W-40 API SG or higher (refer to manual).
Fork Oil:
Refer to manual for specific viscosity and type (e.g., SAE 10W).
Brake Fluid:
Not applicable for drum brakes; refers to brake cable lubrication.
Carburetor Fouling:
Can occur with prolonged storage or poor fuel quality, requiring cleaning and adjustment.
Chain Wear:
Regular adjustment and lubrication are crucial to prevent premature wear and sprocket damage.
Suspension Seals:
Fork seal leaks can occur with hard use, requiring replacement.
Heritage:
Yamaha's long-standing tradition in motocross and off-road racing, known for innovative and reliable designs.
Predecessors:
Successor to earlier Yamaha trail bikes, building on a legacy of accessible off-road performance.
Generation Note:
The TT-R125L (Long wheel base, 'L' variant) was introduced with specific chassis and suspension tuning for enhanced stability and rider comfort compared to standard models.
Manufacturing Location:
Japan (primarily), potentially other Yamaha global facilities.
