Category:
Entry-level to intermediate off-road/trail motorcycle.
Target Audience:
Beginner riders, younger riders, trail enthusiasts, and those seeking a reliable and simple-to-maintain off-road machine.
Competitors:
Honda CRF150F, Kawasaki KLX125/KLX140, Suzuki DR-Z125.
Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve.
Chassis Type:
Steel semi-double cradle frame.
Suspension Setup:
Telescopic front fork and monocross rear suspension.
Ease Of Use:
Known for its user-friendly nature, making it a popular choice for learning and trail riding.
Primary Coverage:
Comprehensive service, repair, and maintenance for the 2002 Yamaha TTR 125.
Specific Systems:
Engine, transmission, electrical system, fuel system, exhaust system, suspension, brakes, chassis, bodywork, and troubleshooting.
Type:
Service and Repair Manual
Purpose:
To guide owners and technicians through maintenance, troubleshooting, and repair procedures.
Format:
Digital Download (PDF)
Engine:
Detailed breakdown of the 124cc 4-stroke engine, including top-end (cylinder head, valve train), bottom-end (crankcase, crankshaft, connecting rod), piston, rings, and camshaft.
Transmission:
Coverage of the 5-speed gearbox, clutch operation, gear selection mechanism, and lubrication.
Fuel System:
Carburetor service (Mikuni VM20), fuel delivery, fuel tank, and fuel lines.
Electrical System:
Ignition system (CDI), lighting, charging system (stator, rectifier/regulator), battery, starter motor (if applicable to specific TTR125 models), and wiring diagrams.
Suspension:
Front fork (telescopic) disassembly, oil change, and seal replacement. Rear shock absorber inspection and replacement. Swingarm and linkage maintenance.
Brakes:
Front and rear drum brake systems. Brake shoe inspection, adjustment, and replacement. Brake cable routing and adjustment.
Chassis:
Frame inspection, steering system (headset bearings), footpegs, and controls.
Bodywork:
Seat, fenders, fuel tank cover, and side covers removal and installation.
Maintenance:
Routine checks, lubrication, filter replacement (air and oil), spark plug service, chain adjustment and lubrication, and general cleaning.
Troubleshooting:
Diagnostic flowcharts and common problem identification for engine performance, electrical issues, and starting problems.
Repair:
Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly.
Technical Specifications:
Torque values for all fasteners, engine tolerances, fluid capacities, and electrical specifications.
Depth:
Intermediate to Advanced. Covers routine maintenance through complete engine rebuilds and component overhauls.
Engine Type:
Air-cooled, four-stroke, SOHC, 2-valve
Bore X Stroke:
54.0 mm x 54.5 mm
Compression Ratio:
9.5:1 (typical)
Oil Capacity:
0.90 L (950 ml) / 1.0 L (with filter change)
Horsepower Estimated:
~10-12 HP @ 7500-8000 RPM (estimated, specific to model variations)
Torque Estimated:
~9.5-10.5 Nm @ 6000-6500 RPM (estimated)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
6.0 L (1.6 US gal)
Safety Certification:
N/A (Off-road motorcycles typically are not subjected to the same road-legal safety certifications as street bikes).
Braking System:
Drum brakes front and rear. Focus on user control and modulation.
Tires:
Off-road specific knobby tires for grip on various terrains.
Frame Construction:
Robust steel frame designed for off-road stress.
Lighting:
Headlight and taillight for visibility (though not always intended for street use depending on local regulations).
Features:
N/A (As an off-road motorcycle, the TTR 125 is focused on mechanical function, not electronic infotainment systems.)
Features:
N/A (No electronic rider aids are present on this model.)
Features:
N/A (No electronic connectivity features.)
Oil Change Interval:
Every 1,000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 500 km (300 miles) or every 3 months. Replacement as needed.
Spark Plug Inspection:
Every 1,000 km (600 miles).
Valve Clearance Check:
Every 3,000 km (1,800 miles) or 12 months.
Engine Oil Grade:
SAE 10W-30 (API SG or higher)
Fork Oil Type:
Yamaha Fork Oil (or equivalent SAE 10W)
Brake Fluid Type:
DOT 3 or DOT 4 (check manual for specific recommendation)
Carburetor Gumming:
Can occur if the motorcycle sits for extended periods without fuel stabilizer, leading to starting or running issues.
Chain Wear:
Regular lubrication and adjustment are crucial to prevent premature wear and ensure smooth operation.
Suspension Seals:
Front fork seal leaks can occur with hard use, requiring replacement.
Maintenance Manual Importance
Value Proposition:
Provides the critical details needed to keep the TTR 125 running reliably and safely, saving time and money on repairs.
Yamaha Legacy:
Yamaha Motor Company has a long and distinguished history in motorsports and motorcycle manufacturing, known for innovation and performance.
Ttr Lineup:
The TTR line is Yamaha's range of trail-oriented motorcycles, offering accessible performance for recreational riding. The TTR125 has been a staple in this segment for many years.
Production Years:
The TTR125 model has been in continuous production for many years, with various iterations and updates.
Category Accolades:
Consistently praised as a top choice for beginner trail bikes due to its reliability, ease of use, and reasonable cost.
User Reviews:
High satisfaction ratings among owners for durability and trail performance.
Manufacturing Standards:
Produced under Yamaha's stringent quality control standards.
