Positioning:
The Yamaha TTR125 is a popular entry-level to intermediate off-road motorcycle, known for its versatility in trail riding, recreational use, and beginner motocross. This manual targets owners and technicians who need comprehensive service information for this specific model year.
Competitors:
Competes with similar displacement off-road motorcycles from brands like Honda (CRF125F), Kawasaki (KLX125/KLX140), and Suzuki (DR-Z125L).
Manual Value Proposition:
Provides factory-level accuracy and completeness, essential for maintaining optimal performance, reliability, and resale value. 'No Extra fees, No Expiry dates' signifies a one-time purchase for unlimited access.
Engine:
Complete engine overhaul, troubleshooting, specifications, disassembly, assembly, cooling system (air-cooled), lubrication system.
Fuel System:
Carburetor (Mikuni VM Series typical), fuel tank, fuel lines, fuel filter, troubleshooting and adjustment.
Ignition System:
CDI ignition, spark plug, ignition coil, troubleshooting and testing.
Transmission:
Clutch operation and adjustment, gearbox inspection and repair, gear shift mechanism, transmission oil specifications.
Drivetrain:
Final drive chain and sprockets maintenance, inspection, and replacement. Chain slack adjustment.
Chassis:
Frame inspection, front fork (suspension) maintenance, disassembly, and assembly. Rear shock absorber inspection and replacement.
Brakes:
Front and rear brake system maintenance, including brake pad inspection and replacement, brake fluid specifications, bleeding procedures, and caliper inspection.
Electrical System:
Wiring diagrams, battery maintenance, lighting system (headlight, taillight, indicators), horn, electrical component testing, troubleshooting.
Wheels And Tires:
Tire pressure specifications, wheel bearing maintenance, spoke tightening and truing (if applicable), rim inspection.
Bodywork And Controls:
Handlebar, levers, footpegs, seat, fenders, plastics, graphics, cable routing and adjustment (throttle, clutch).
Maintenance:
Routine service, oil changes, filter replacements, chain lubrication and adjustment, brake adjustments, spark plug replacement, air filter cleaning/replacement.
Repair:
Complete engine rebuilding, carburetor tuning, suspension overhaul, brake system repairs, electrical troubleshooting and component replacement.
Troubleshooting:
Diagnostic procedures for common problems, fault finding guides, error code explanations (if applicable).
Specifications:
Torque specifications for all fasteners, clearances, fluid capacities, electrical tolerances.
Depth:
Comprehensive. Covers everything from basic rider maintenance to full engine rebuilds and chassis component overhauls. Suitable for both novice mechanics and experienced technicians.
Engine Type:
Four-stroke, SOHC, Air-cooled
Displacement:
124cc (typically)
Bore X Stroke:
Refer to manual for exact specifications (e.g., 54mm x 54.5mm typical)
Compression Ratio:
Refer to manual for exact specifications (e.g., 10.3:1 typical)
Valve Clearance Intake:
Refer to manual for exact specifications (e.g., 0.02-0.03mm typical)
Valve Clearance Exhaust:
Refer to manual for exact specifications (e.g., 0.04-0.05mm typical)
Horsepower:
Estimated 10-12 HP (refer to manual for precise rating)
Torque:
Refer to manual for exact specifications
Carburetor Type:
Mikuni VM Series (e.g., VM20 or VM22 typical)
Carburetor Jetting:
Manual provides detailed specifications for main jet, pilot jet, needle position, and air screw for various conditions.
Fuel Type:
Unleaded gasoline (Octane rating specified in manual)
Oil Type:
Yamalube 4 (or equivalent JASO MA certified 10W-40 motorcycle oil)
Oil Capacity With Filter Change:
Refer to manual for exact capacity (e.g., ~0.9 - 1.0 Liters typical)
Overall Length:
Refer to manual for exact specifications (e.g., ~1835 mm typical)
Overall Width:
Refer to manual for exact specifications (e.g., ~760 mm typical)
Overall Height:
Refer to manual for exact specifications (e.g., ~1095 mm typical)
Seat Height:
Refer to manual for exact specifications (e.g., ~805 mm typical)
Ground Clearance:
Refer to manual for exact specifications (e.g., ~245 mm typical)
Curb Weight:
Refer to manual for exact specifications (e.g., ~82 kg / 181 lbs typical)
Fuel Tank Capacity:
Refer to manual for exact specifications (e.g., ~6.0 Liters / 1.6 Gallons typical)
Engine Oil Change:
Recommended every 1,000 km or 3 months, whichever comes first. (Consult manual for precise interval).
Air Filter Cleaning:
Recommended every 500 km or as needed based on riding conditions (dusty environments require more frequent cleaning/replacement). (Consult manual for precise interval).
Chain Lubrication Adjustment:
Recommended every 300 km or after washing/riding in wet conditions. (Consult manual for precise interval).
Spark Plug Replacement:
Refer to manual for recommended replacement interval (e.g., 3,000-5,000 km).
Engine Oil Specification:
Yamalube 4 (or equivalent JASO MA certified 10W-40 motorcycle oil)
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (refer to manual for specific recommendation)
Transmission Oil Specification:
Yamalube 4 (or equivalent API SG or higher, SAE 10W-30 motorcycle oil)
Common Wear Items:
Clutch plates, chain and sprockets, brake pads, fork seals, wheel bearings, air filter degradation.
Carburetor Tuning:
Can require periodic adjustment for optimal performance, especially with altitude or temperature changes. Manual provides guidance.
Electrical Connections:
As with many off-road vehicles, ensuring clean and secure electrical connections is important to prevent intermittent issues.
Yamaha Legacy:
Yamaha Motor Corporation has a long and successful history in powersports, dating back to the 1950s. They are renowned for their innovation, performance, and reliability across motorcycles, ATVs, and watercraft.
Ttr Lineage:
The TTR series has been a cornerstone of Yamaha's off-road lineup, offering models from small-displacement beginner bikes to larger-displacement competition machines. The TTR125 has been a popular choice for young riders and recreational trail riders for many years, evolving with minor updates over its production run.
Production Period:
The TTR125 model has been in production for many years, with variations in specifications and features across different model years and sub-models (e.g., TTR125L, TTR125LE).
