Target User:
DIY enthusiasts, home mechanics, and novice technicians looking to perform repairs and maintenance on their Yamaha TTR125.
Cost Savings:
Enables users to perform repairs themselves, saving significant costs associated with professional shop labor.
Ease Of Use:
Manual is designed to make repair jobs easy to understand and execute.
Engine:
Detailed coverage of the 125cc four-stroke engine, including disassembly, inspection, assembly, and tuning.
Fuel System:
Carburetor (Mikuni VM series likely) inspection, cleaning, adjustment, and jetting procedures.
Ignition System:
CDI ignition system troubleshooting, timing checks, and component testing.
Transmission:
Complete clutch and gearbox disassembly, inspection, reassembly, and service.
Suspension:
Front fork (conventional or upside-down depending on variant) and rear shock absorber service, including oil changes and seal replacement.
Brakes:
Front and rear brake system servicing, including hydraulic fluid changes, pad replacement, caliper maintenance, and bleeding procedures.
Electrical System:
Wiring diagrams, component testing (lights, horn, kill switch), battery maintenance, and troubleshooting.
Cooling System:
Air-cooled engine specifications and maintenance.
Frame And Bodywork:
Chassis inspection, suspension mounting, body panel removal and installation.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug inspection, air filter cleaning/replacement.
Troubleshooting:
Diagnostic guides for common problems, symptom-based troubleshooting charts.
Engine Rebuild:
Comprehensive step-by-step instructions for complete engine overhaul.
Component Overhaul:
Detailed procedures for rebuilding carburetors, brake calipers, and suspension components.
Depth:
Professional quality, in-depth service and repair manual covering all aspects of maintenance and repair.
Engine Type:
Air-cooled, 4-stroke, SOHC
Displacement:
124cc (approximately)
Bore X Stroke:
Typically around 54mm x 54.5mm (check specific variant for exact figures)
Compression Ratio:
Typically around 9.5:1 to 10.0:1 (check specific variant)
Horsepower:
Estimated 8-10 HP (varies by specific model year and tuning)
Torque:
Estimated 6-8 lb-ft (varies by specific model year and tuning)
Carburetor Model:
Likely Mikuni VM series (e.g., VM20 or similar)
Fuel Type:
Unleaded gasoline (minimum 87 octane)
Oil Type:
API SG or higher, SAE 10W-30 or 20W-40 motorcycle specific oil recommended.
Oil Capacity:
Approximately 0.9 - 1.0 liters (check manual for exact figure and procedure).
Transmission Type:
5-speed constant mesh manual transmission
Clutch Type:
Wet, multi-plate
Gear Ratios:
Specific gear ratios will be detailed within the manual for accurate rebuilding and troubleshooting.
Transmission Oil Type:
Use Yamalube 4 (or equivalent 10W-30) motorcycle oil, or API SE, SF, SG type motor oil.
Wheelbase:
Varies slightly by year/variant, typically around 1300-1340 mm (51.2-52.8 inches).
Seat Height:
Varies, but generally around 800-830 mm (31.5-32.7 inches).
Dry Weight:
Approximately 94-98 kg (207-216 lbs).
Fuel Tank Capacity:
Typically around 5.0 - 5.5 liters (1.3 - 1.5 US gallons).
Oil Change Interval:
Recommended every 3,000 km (1,800 miles) or 6 months, whichever comes first. Frequent checks advised for off-road use.
Spark Plug Inspection:
Inspect every 1,000 km (600 miles). Replace as needed based on condition.
Air Filter Cleaning:
Clean every 1,000 km (600 miles) or more frequently in dusty conditions. Replace as needed.
Chain Lubrication Adjustment:
Lubricate and adjust chain slack every 1,000 km (600 miles).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Fork Oil Type:
Specific fork oil viscosity will be detailed in the manual (e.g., SAE 10W).
Carburetor Cleaning:
Carburetors can be prone to clogging if fuel is left in the tank for extended periods or if the fuel is contaminated. Regular cleaning and stabilizer use are recommended.
Chain Wear:
Off-road riding can accelerate chain and sprocket wear. Proper lubrication and adjustment are critical.
Suspension Seals:
Fork seals can develop leaks over time, especially with heavy use. Regular inspection is advised.
Yamaha Legacy:
Yamaha is a renowned Japanese manufacturer with a long history of producing high-quality motorcycles, including a strong presence in off-road and dual-sport segments.
Ttr Lineage:
The TTR line is Yamaha's range of off-road motorcycles, known for their reliability and ease of use, catering to recreational riders and aspiring racers.
Manufacturing Origin:
Yamaha motorcycles are predominantly manufactured in Japan, with some production facilities in other countries.
