Segment:
Entry-level to intermediate dirt bike, popular for trail riding, recreational use, and beginner motocross.
Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX125/KLX140, Suzuki DR-Z125.
Vehicle Attributes:
Reliable air-cooled engine, user-friendly power delivery, durable chassis, multiple variants catering to different rider sizes and preferences (L for Long/Large wheel, E for Electric Start).
Benefit To Owner:
Empowers owners to perform maintenance, troubleshoot issues, and conduct repairs themselves, saving time and money while ensuring optimal performance and longevity of their Yamaha TT-R125.
Engine Systems:
Engine disassembly, assembly, troubleshooting, maintenance, performance tuning, component identification, lubrication, cooling system.
Fuel System:
Carburetor adjustment and overhaul, fuel tank, fuel lines, fuel filter.
Transmission Clutch:
Clutch operation, adjustment, replacement; gearbox disassembly, assembly, inspection, maintenance.
Suspension Steering:
Front fork (telescopic), rear shock absorber (monoshock), linkage, steering stem, bearings, lubrication, adjustments.
Brakes:
Front and rear brake systems (likely drum or disc depending on variant), brake fluid, caliper, master cylinder, brake pads, lines, bleeding procedures.
Electrical System:
Ignition system, charging system (stator, regulator/rectifier), lighting, battery, wiring diagrams, troubleshooting electrical faults.
Chassis Frame:
Frame inspection, swingarm, wheel bearings, chain adjustment, sprocket replacement, general chassis maintenance.
Bodywork Plastics:
Seat removal, fuel tank cover, fenders, handle bars, controls, graphics.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, tire pressure checks, brake inspection, spark plug replacement.
Troubleshooting Diagnostics:
Systematic approach to identifying and resolving common mechanical and electrical issues, fault codes (if applicable).
Component Overhaul:
Detailed step-by-step instructions for disassembling, cleaning, inspecting, repairing, and reassembling major components (engine, gearbox, forks, etc.).
Wiring Diagrams:
Comprehensive electrical schematics for fault finding and component testing.
Torque Specifications:
Precise torque values for all critical fasteners to ensure correct assembly and prevent damage.
Special Tools:
Identification and usage of any specialized tools required for specific repair procedures.
Depth:
Comprehensive, covering everything from basic maintenance to full engine rebuilds and advanced diagnostics.
Type:
4-stroke, SOHC, 2-valve, Air-cooled
Bore X Stroke:
54.0 mm x 54.5 mm
Horsepower Estimated:
~10-12 HP (Varies by specific model and tuning)
Torque Estimated:
~7-8 lb-ft (Varies by specific model and tuning)
Carburetor:
Mikuni VM17 (or similar 17mm constant velocity)
Fuel Capacity:
1.6 Gallons (6.1 L)
Oil Type:
Yamalube 4 (or SAE 10W-30 API SG type or higher)
Oil Capacity:
0.9 L (0.95 US qt) without filter change, 1.0 L (1.05 US qt) with filter change
Ignition System:
CDI (Capacitor Discharge Ignition)
Spark Plug:
NGK CR9E (or equivalent)
Seat Height:
Standard: 31.1 inches (790 mm); LW/LWE: 33.7 inches (855 mm)
Ground Clearance:
Standard: 10.8 inches (275 mm); LW/LWE: 12.4 inches (315 mm)
Wheelbase:
Standard: 49.9 inches (1270 mm); LW/LWE: 51.2 inches (1300 mm)
Curb Weight:
Standard: ~214 lbs (97 kg); E/LWE: ~218 lbs (99 kg) (Approximate, varies by specific model and fluid levels)
Front Tire Size:
70/100-17 (Standard), 70/100-19 (LW/LWE)
Rear Tire Size:
90/100-14 (Standard), 90/100-16 (LW/LWE)
Front Suspension Travel:
6.5 inches (165 mm)
Rear Suspension Travel:
7.1 inches (180 mm)
Safety Features Design:
Designed for off-road use, features robust construction and rider control aids. ABS or advanced electronic safety features are not present, consistent with its class.
Braking System:
Front Drum (Standard), Front Disc (E, LW, LWE - check specific variant), Rear Drum Brake.
Frame Construction:
Steel semi-double cradle frame for stability and durability.
Oil Change:
Every 600 miles (1,000 km) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 300 miles (500 km) or monthly, depending on riding conditions.
Spark Plug Check:
Every 600 miles (1,000 km)
Chain Lubrication:
Every 300 miles (500 km) or after washing/riding in wet conditions.
Valve Clearance Check:
Every 6,000 miles (10,000 km) or as specified in the manual.
Engine Oil Spec:
Yamalube 4 (or SAE 10W-30 API SG type or higher)
Brake Fluid Spec:
DOT 3 or DOT 4 (refer to specific manual for exact type)
Fork Oil Spec:
Yamaha Fork Oil G10 or equivalent SAE 10W (refer to specific manual for capacity)
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, tires, air filter degradation, carburetor jetting sensitivity to altitude/temperature.
Potential Problems:
Carburetor gumming if fuel sits, occasional electrical connector corrosion, throttle cable wear, kickstart mechanism durability if abused.
Yamaha Legacy:
Yamaha Motor Company, a global leader in motorcycles, marine products, and musical instruments, known for innovation and performance.
Tt-R Lineage:
The TT-R line represents Yamaha's commitment to accessible and fun off-road motorcycles. The TT-R125 has been a staple in this segment for many years, evolving with features like electric start and larger wheel options.
Manufacturing Location:
Likely manufactured in Japan or other Yamaha global facilities.
