Yamaha DT125 DT125R 1988-2002 Workshop Service Repair Manual

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Type: Motorcycle

Vendor:

Sku: 50993

Tags: 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 DT125 DT125R Marine Motorcycle Sterndrive Yamaha

Product variants

Description

This manual provides comprehensive guidance for the DT125R, a versatile dual-sport motorcycle produced from 1988 to 2002. Renowned for its agility and reliable liquid-cooled, 2-stroke engine, the DT125R has earned a strong reputation in the dual-sport segment. Its design balances off-road capability with on-road usability, making it a popular choice for riders seeking adventure. The DT series, with its roots in pioneering dual-sport concepts, represents a significant lineage of off-road engineering, and the DT125R embodies this heritage with its focused performance and robust construction. This workshop service repair manual is meticulously compiled to assist both DIY enthusiasts and professional mechanics in maintaining and repairing the DT125R. It covers a vast array of critical systems, including detailed engine disassembly and assembly, transmission procedures, electrical system diagnostics with wiring diagrams, fuel system maintenance, cooling system servicing, suspension and brake system repairs, and chassis and bodywork guidance. The manual offers step-by-step instructions, troubleshooting advice, and routine maintenance schedules, ensuring the optimal performance and longevity of your motorcycle. With hundreds of pages featuring detailed substeps, notes, cautions, warnings, and visual aids such as photos and illustrations, this English-language manual is an indispensable resource for any owner.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

DT125

Model Variant:

DT125R

Product Name:

Yamaha DT125 DT125R 1988-2002 Workshop Service Repair Manual PDF Download

👋 Introduction

Market Position

Target Audience:

DIY enthusiasts and professional mechanics working on Yamaha DT125R models.

Key Features

Detail Level:

Hundreds of pages with detailed substeps, notes, cautions, warnings, numbered instructions, and bold figure numbers.

Visuals:

Includes hundreds of photos, illustrations, drawings, and enlarged insets for clarity.

Searchability:

Numbered table of contents for quick information retrieval.

Value Proposition

Cost Effectiveness:

Inexpensive way to keep the vehicle working properly, saving on professional labor costs.

📋 Manual Details

Coverage Areas

Covered Years:

1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002

Page Count

Estimated Pages:

Hundreds (exact number not specified, but implied to be substantial)

Manual Type

Type:

Workshop Service Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Complete engine disassembly, assembly, tuning, diagnostics, and repair.

Transmission:

Gearbox removal, inspection, repair, and adjustment procedures.

Electrical System:

Detailed wiring diagrams, troubleshooting, component testing, and repair of electrical circuits.

Fuel System:

Carburetor disassembly, cleaning, adjustment, and fuel system maintenance.

Cooling System:

Liquid-cooled system maintenance and repair procedures.

Suspension:

Front fork and rear shock absorber maintenance, rebuild, and adjustment.

Brakes:

Hydraulic disc brake system servicing, including caliper, master cylinder, and fluid replacement.

Chassis And Frame:

Frame inspection, component mounting, and general chassis maintenance.

Bodywork:

Fairings, plastics, seat, and other body component removal, installation, and repair.

Procedures Included

Maintenance:

Routine maintenance tasks, lubrication, fluid changes, filter replacements, and adjustments.

Troubleshooting:

Step-by-step diagnostic procedures for identifying and resolving common and uncommon problems.

Repair:

Detailed instructions for component repair, replacement, and reassembly.

Overhaul:

Complete engine and gearbox overhaul procedures.

Reassembly:

Comprehensive guidance on correct reassembly of all vehicle components.

Technical Depth

Depth:

Complete factory service manual covering all aspects of repair and maintenance for experienced mechanics and DIY enthusiasts.

📊 Manual Specifications

File Format

Format:

Compatibility:

All PC-based Windows operating systems and Mac OS.

Print Quality

Printability:

Printable without any restriction; entire manual or specific pages can be printed.

Delivery

Method:

Instant download link provided on the checkout page after payment.

Requirements

Software Needed:

Adobe PDF Reader

Binding Type

Type:

Digital Download (PDF)

Paper Type

Type:

N/A (Digital)

⚙️ Engine Specifications

Primary Engine

Type:

Liquid-cooled, 2-stroke, reed valve

Displacement:

124cc (Specific displacement might vary slightly by sub-model, but 125cc is the defining characteristic)

Bore X Stroke:

Information available in manual (typical for 125cc 2-strokes of this era, e.g., 56.5 x 49.8 mm)

Carburetion:

Single carburetor (e.g., Mikuni VM26SS, but specific model details will be in the manual)

Performance

Horsepower:

Approximately 15-20 HP (varies by year and specific market tuning, detailed specs in manual)

Torque:

Information available in manual

Fuel System

Fuel Type:

Unleaded gasoline mixed with 2-stroke oil (pre-mix or Autolube system, detailed in manual)

Oil Delivery:

Autolube system with separate oil reservoir (standard on DT125R models)

🔧 Transmission

Standard

Type:

Constant mesh, 6-speed sequential return

Gear Ratios:

Detailed ratios available in manual

Features

Clutch:

Wet, multiple disc

📐 Dimensions

Exterior

Length:

Information available in manual (typical for this class of enduro bike)

Width:

Information available in manual

Height:

Information available in manual

Weights

Dry Weight:

Approximately 115-120 kg (varies by year and specific features, manual will confirm)

Wet Weight:

Information available in manual

🛡️ Safety Features

Active Features

Brakes:

Front: Hydraulic disc brake; Rear: Drum brake (some later models may have rear disc, manual will specify)

Passive Features

Lighting:

Headlight, taillight, brake light, turn signals (as per road legality requirements for R models)

💡 Technology Features

Infotainment

Features:

Basic instrumentation: speedometer, odometer, tachometer, engine temperature warning light.

Driver Assistance

Features:

N/A for this model; focused on mechanical operation and rider control.

🔧 Maintenance

Service Intervals

Oil Change:

Detailed schedule available in manual (typically every few thousand kilometers or as per usage)

Spark Plug:

Recommended replacement intervals in manual

Air Filter:

Cleaning and replacement intervals specified in manual

Brake Fluid:

Recommended replacement schedule and procedures in manual

Fluid Specifications

Engine Oil:

Specific 2-stroke oil recommendations and mixing ratios (or Autolube oil spec) will be detailed in the manual.

Transmission Oil:

Yamalube or equivalent SAE 10W-30 API SE classification (verify in manual for exact spec)

Coolant:

Permanent type antifreeze coolant (e.g., 50% ethylene glycol and 50% deionized water) - specifications in manual.

Known Issues

Common Wear Items:

Piston rings, clutch plates, exhaust valves (on models with YPVS), and fork seals are common wear items detailed for inspection and replacement in the manual.

Carburetor Tuning:

Carburetor tuning can be sensitive to altitude and modifications; the manual provides baseline settings and tuning guides.

Ypvs System:

Yamaha Power Valve System (YPVS) requires proper cleaning and adjustment for optimal performance; the manual covers its maintenance in detail.

📚 Vehicle History

Brand Heritage

Yamaha Motorcycles:

Yamaha has a long and successful history in motorcycle manufacturing, particularly in off-road and dual-sport segments with models like the DT series.

Model Evolution

Dt Series:

The DT series, introduced in the late 1960s, was revolutionary for its time, popularizing the dual-sport concept. The DT125R was a significant evolution, featuring liquid cooling and improved performance for its class.

Production

Years Of Production:

The DT125R was produced for an extended period, with this manual covering a significant portion of its lifespan from 1988 to 2002, indicating consistent popularity and evolution.

🏆 Awards & Recognition

Recognitions

Model Reputation:

The DT125R is widely regarded as a robust and capable dual-sport motorcycle known for its agility and reliability in its class.