🏷️ Basic Information

Make:

Yamaha

Model:

TTR125 (also referred to as TTR-125, TT-R125, TT-R125LW)

Model Designations:

Model Year:

2003

Product Name:

Now Yamaha TTR125 TTR-125 TT-R125 TT-R 2003 03 Service Repair Workshop Manual

Product Description:

This is a COMPLETE SERVICE REPAIR MANUAL for the Yamaha TTR125 TTR-125 TT-R125 TT-R TT-R125LW 2003 03. Will work with similar years and models.

👋 Introduction

Segment:

Entry-level to intermediate off-road/trail motorcycle. Popular for youth riders, beginners, and trail riding.

Target Audience:

Enthusiasts and mechanics looking for detailed repair and maintenance guidance for their Yamaha TTR125.

Competitors:

Honda CRF100F/XR100, Kawasaki KLX110/KLX125, Suzuki DR-Z125.

Key Advantages:

Known for its reliability, user-friendly nature, and versatility for trail riding and recreational use. The LW (Long Wheelbase) model offers increased stability.

Manual Value Proposition:

Provides factory-level detail for cost-effective maintenance and repair, empowering owners to perform their own servicing.

Vehicle Key Features:

Air-cooled 4-stroke engine, electric start (on some variants/years, but likely kick start on base 2003), durable chassis, comfortable suspension for trail use.

📋 Manual Details

Primary Coverage:

Complete service and repair for the 2003 Yamaha TTR125 series, including the TT-R125LW variant.

Secondary Coverage Notes:

Explicitly states compatibility with similar model years, suggesting broader applicability to a range of TTR125 models around the 2003 production era.

Estimated Page Count:

Typically 300-500 pages for a comprehensive workshop manual of this nature, though specific count is not provided in product info.

Type:

Service Repair Workshop Manual

Language:

English (standard for Yamaha workshop manuals)

Format:

Likely digital (PDF) given the 'copy and paste link' for other years, but could be available in print. Assumed digital for comprehensive searchability.

📖 Manual Coverage

Engine:

Detailed coverage of the TTR125 engine, including disassembly, assembly, tuning, diagnostics, lubrication, cooling system, and component specifications.

Transmission:

Comprehensive information on the transmission system, including gear selection, clutch operation, lubrication, and potential repair procedures.

Fuel System:

In-depth coverage of the carburetor (likely Mikuni VM series), fuel lines, fuel tank, and associated components. Includes adjustments and troubleshooting.

Ignition System:

Details on the CDI ignition system, spark plug specifications, timing, and troubleshooting.

Electrical System:

Wiring diagrams, component testing, battery maintenance, lighting systems, and starter motor operation.

Chassis And Suspension:

Front fork (telescopic) and rear suspension (monoshock) overhaul, adjustment, and maintenance. Frame inspection and alignment.

Brakes:

Front and rear brake system maintenance, including hydraulic fluid replacement, pad inspection/replacement, caliper service, and drum brake adjustment (if applicable).

Wheels And Tires:

Tire pressure recommendations, wheel bearing service, spoke tensioning (for spoked wheels), and rim specifications.

Bodywork And Trim:

Information on plastic body panels, seat removal, handlebar assembly, and minor bodywork repairs.

Routine Maintenance:

Oil changes, filter replacements, chain adjustment, spark plug checks, and general inspection procedures.

Troubleshooting:

Systematic diagnostic guides for common problems and failures, enabling users to identify and resolve issues effectively.

Engine Rebuild:

Detailed step-by-step instructions for engine disassembly, component inspection, honing, piston/ring replacement, and reassembly.

Carburetor Overhaul:

Instructions for cleaning, inspecting, and rebuilding the carburetor, including jetting and mixture adjustments.

Suspension Servicing:

Fork seal replacement, oil level checks and changes, shock absorber servicing.

Electrical Diagnostics:

Testing electrical components, tracing wiring faults using diagrams, and troubleshooting charging system issues.

Brake System Repair:

Bleeding brake lines, replacing brake pads and shoes, servicing brake calipers and master cylinders.

Depth:

Comprehensive, covering everything from basic owner maintenance to in-depth mechanical repairs and diagnostics. Suitable for home mechanics and professional technicians.

Diagnostic Procedures:

Includes specific diagnostic trees and fault finding methods for various systems.

Special Tools:

Likely specifies any unique or specialized tools required for specific procedures, often with Yamaha part numbers.

📊 Manual Specifications

Digital Format:

Assumed PDF for ease of use, searchability, and accessibility. High-resolution scans of original factory documents.

Print Quality Description:

If printed, expect clear text and legible diagrams. Digital versions offer zoom capabilities for clarity.

Binding Type If Printed:

Typically comb-bound or spiral-bound for lay-flat usability in a workshop environment.

Paper Type If Printed:

Durable, semi-gloss paper to withstand workshop conditions and repeated use.

⚙️ Engine Specifications

Engine Type:

4-stroke, SOHC, 2-valve

Displacement:

124cc

Bore X Stroke:

54.0 mm x 54.5 mm

Compression Ratio:

9.5:1 (typical for this engine)

Cooling System:

Air-cooled

Lubrication:

Wet sump

Starting System:

Kick starter

Horsepower:

Approximately 10-12 HP (exact figure varies by source and tune)

Torque:

Not typically published for this class of bike, but designed for low-end grunt.

Carburetor Type:

Mikuni VM20 (typical for 2003 model)

Fuel Type:

Unleaded gasoline

Fuel Tank Capacity:

Approximately 1.5 gallons (5.7 L)

🔧 Transmission

Transmission Type:

5-speed constant mesh

Clutch Type:

Wet, multiple-disc

Final Drive:

Chain drive

Transmission Variants:

N/A for standard model years

Gear Ratios:

Specific gear ratios are detailed within the manual, crucial for performance tuning and understanding operation.

Transmission Oil:

Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA)

📐 Dimensions

Overall Length:

Approximately 70.9 inches (1800 mm) for standard, LW model is longer.

Overall Width:

Approximately 30.1 inches (765 mm)

Overall Height:

Approximately 42.1 inches (1070 mm)

Seat Height:

Approximately 31.7 inches (805 mm)

Wheelbase:

Approximately 48.8 inches (1240 mm) for standard, LW model is longer (e.g., 50.4 inches / 1280mm).

Wet Weight:

Approximately 174 lbs (79 kg)

Dry Weight:

Approximately 165 lbs (75 kg)

Front Tire Size:

2.50-17 4PR

Rear Tire Size:

4.10-18 4PR

Wheelbase Specifications:

The 'LW' designation specifically refers to a 'Long Wheelbase' model, providing enhanced stability for larger riders or rougher terrain.

🛡️ Safety Features

Safety Ratings:

Not applicable for off-road motorcycles in the same way as cars. Focus is on mechanical integrity and rider control.

Braking System:

Front disc brake, rear drum brake (typical for this model). Manual provides procedures for optimal performance and safety.

Suspension Tuning:

The manual assists in proper suspension setup for rider weight and terrain, crucial for stability and control.

Frame Construction:

Steel semi-double cradle frame, known for its strength and durability in off-road conditions.

💡 Technology Features

Infotainment System:

N/A (Basic off-road motorcycle)

Driver Assistance Features:

N/A (Basic off-road motorcycle)

Connectivity Features:

N/A (Basic off-road motorcycle)

Lighting System:

Standard headlight, taillight, and brake light. Manual covers bulb replacement and electrical checks.

🔧 Maintenance

Engine Oil Change:

Every 1000 km (600 miles) or 6 months, whichever comes first (refer to manual for exact specifications).

Spark Plug Inspection:

Every 1000 km (600 miles)

Air Filter Cleaning:

Every 500 km (300 miles) or as needed in dusty conditions.

Chain Lubrication And Adjustment:

Every 200 km (125 miles)

Engine Oil Type:

Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA specification)

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid

Coolant Type:

Not applicable (air-cooled engine)

Common Wear Items:

Clutch plates, brake pads, chain and sprockets, wheel bearings, fork seals.

Carburetor Tuning Sensitivity:

Can be sensitive to altitude and temperature changes, requiring periodic adjustment for optimal performance. Manual provides correct procedures.

Suspension Firmness:

Stock suspension can be firm for larger riders; manual guides on adjustments or potential upgrades.

📚 Vehicle History

Manufacturer:

Yamaha Motor Corporation, a Japanese manufacturer with a long history of producing motorcycles, musical instruments, and other motorized products.

Ttr Series Lineage:

The TTR series is Yamaha's line of beginner-friendly, air-cooled, four-stroke dirt bikes, designed for trail riding and recreational off-roading. The TTR125 specifically replaced smaller displacement models and evolved over time with different wheel sizes and chassis configurations (e.g., LW for long wheelbase).

Production Period:

The TTR125 platform has been in production for many years, with the 2003 model being a key iteration.

🏆 Awards & Recognition

Industry Awards:

While the TTR125 itself might not have specific 'awards' in the traditional sense, it is widely recognized as a benchmark for entry-level off-road bikes for its reliability and ease of use.

User Ratings:

Consistently high user satisfaction for its intended purpose as a trail bike.