Yamaha DT125 DT125R 1987 1988 Service Repair Workshop Manual

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Art.-Nr: 57946

Stichworte: 1987 1988 DT125 DT125R Marine Motorcycle Sterndrive Yamaha

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Beschreibung

This manual covers the DT125R, a robust dual-sport motorcycle produced for the 1987 and 1988 model years. Representing the third generation of the esteemed DT125R lineage, this machine is engineered for versatility, offering capable performance both on and off paved roads. The legacy of building reliable and performance-oriented motorcycles is evident in the DT125R, known for its durable 2-stroke engine and agile handling, making it a popular choice for adventure and everyday riding. This comprehensive service repair workshop manual is designed to provide detailed guidance for the maintenance and repair of your 1987-1988 DT125R. It covers a wide array of essential topics, including engine specifications, drivetrain, chassis, and electrical systems. Within its pages, you will find step-by-step instructions for basic maintenance, intermediate repairs, and advanced diagnostics, along with crucial troubleshooting information and wiring diagrams. This manual is an indispensable resource for owners and technicians alike, ensuring the longevity and optimal performance of the vehicle through accurate and accessible technical information.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

DT125R

Year:

1987, 1988

Codes

Engine Code:

Likely 1G8 or similar for this generation DT125R (specific code not explicitly stated in product info)

Generation

Model Generation:

Third Generation DT125R (based on model years)

👋 Introduction

Market Position

Target Audience:

Owners of Yamaha DT125R (1987-1988), independent mechanics, enthusiasts seeking to maintain or repair their motorcycle.

Competitive Analysis

Value Proposition:

Provides dealership-level repair information, enabling significant cost savings on maintenance and repairs.

Key Features

Unique Selling Points:

Vehicle-specific, accurate, clear, concise text with diagrams/illustrations, wiring schematics, step-by-step instructions, advanced troubleshooting.

Accessibility:

Downloadable PDF format for easy access on multiple devices.

📋 Manual Details

Coverage Areas

Primary Coverage:

Service, Repair, Workshop

Scope:

Comprehensive for 1987-1988 Yamaha DT125R models

Page Count

Estimated Page Count:

Varies by specific manual version, but likely extensive due to detail level. Typical service manuals for this era are 200-500+ pages.

Manual Type

Type:

Service Repair Workshop Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Engine Specifications, Engine Removal and Installation, Fuel System, Intake & Exhaust

Drivetrain:

Transmission, Drive Chain, Sprockets

Chassis:

Steering System, Shocks, Body Work

Electrical:

Electrical System, Wiring Diagram

Maintenance:

Routine Maintenance, Periodic Checks and Adjustments, Lubrication, Cooling System

Procedures Included

Basic Maintenance:

Oil changes, spark plug replacement, air filter cleaning/replacement, chain adjustment, brake adjustments.

Intermediate Repair:

Engine tune-ups, carburetor cleaning and adjustment, clutch service, brake system servicing, suspension component replacement.

Advanced Repair:

Engine disassembly and reassembly, transmission overhaul, electrical system diagnostics and repair, chassis component replacement.

Troubleshooting:

Advanced Troubleshooting, diagnostics for common and uncommon issues.

Technical Depth

Depth:

Comprehensive, suitable for both amateur mechanics and professional technicians.

Diagnostic Tools:

Includes information implicitly suggesting use of standard motorcycle diagnostic tools and torque wrenches.

📊 Manual Specifications

File Format

File Type:

Print Quality

Printability:

Yes, individual pages are printable.

Binding Type

Binding:

N/A (Digital PDF format)

Paper Type

Paper Quality:

N/A (Digital PDF format)

Compatibility

Operating Systems:

All Versions of Windows AND Mac

Requirements

Software Requirements:

Adobe PDF Reader

⚙️ Engine Specifications

Primary Engine

Engine Type:

2-stroke, liquid-cooled, reed valve induction (typical for DT125R of this era)

Displacement:

123 cc (approximately)

Bore X Stroke:

Specifics available within the manual, typically around 56.5 mm x 49.8 mm

Compression Ratio:

Specifics available within the manual, likely around 7.2:1 or higher

Performance

Horsepower:

Typically around 15-20 HP depending on specific market regulations. Exact figures in manual.

Torque:

Specific figures available within the manual.

Fuel System

Carburetor Type:

Likely a single Mikuni VM series carburetor. Specific model (e.g., VM28) in manual.

Fuel Type:

Unleaded gasoline (minimum octane rating to be specified in manual).

Fuel Mixture:

Pre-mix (gasoline and 2-stroke oil) or Oil Injection system (specifics in manual).

🔧 Transmission

Standard

Transmission Type:

6-speed constant mesh, sequential.

Optional

Optional Transmission:

Features

Clutch Type:

Wet, multiple disc.

Gear Ratios:

Detailed gear ratios for each speed are provided in the manual.

Transmission Oil Type:

Specific Yamaha recommended oil or equivalent Yamalube 2-stroke oil type and capacity detailed in manual.

📐 Dimensions

Exterior

Overall Length:

Specifics available in manual, but typical for a dual-sport of this era.

Overall Width:

Specifics available in manual.

Overall Height:

Specifics available in manual.

Wheelbase:

Specifics available in manual, typically around 1390 mm (54.7 in).

Weights

Dry Weight:

Specifics available in manual, typically around 110-115 kg (242-253 lbs).

Wet Weight:

Specifics available in manual (includes all fluids).

Fuel Capacity:

Specifics available in manual, typically around 10 liters (2.6 US gal).

🛡️ Safety Features

Ratings

Safety Ratings:

N/A (Motorcycle safety ratings are not typically standardized like automotive crash tests).

Active Features

Braking System:

Front disc brake, rear drum brake (typical for this model year). Specifications in manual.

Suspension Type:

Telescopic front fork, Monocross rear suspension. Adjustment and maintenance procedures in manual.

💡 Technology Features

Infotainment

Infotainment System:

N/A (This is a 1980s dual-sport motorcycle, no advanced infotainment features.)

Driver Assistance

Driver Assistance Systems:

N/A (No electronic driver assistance systems.)

Connectivity

Connectivity Features:

N/A (No electronic connectivity features.)

Lighting

Headlight Type:

Halogen (typical for the era). Bulb specifications in manual.

Taillight Type:

Incandescent bulb. Bulb specifications in manual.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Specific mileage or time interval provided in the manual. For 2-strokes, focus is on pre-mix or oil injection system checks.

Spark Plug Replacement:

Intervals and correct spark plug type (e.g., NGK BR9ES) detailed in the manual.

Air Filter Cleaning:

Recommended cleaning intervals and cleaning agents (e.g., mild soap and water or specialized cleaner) are in the manual.

Chain Lubrication Adjustment:

Regular intervals recommended, specific slack allowance detailed in manual.

Fluid Specifications

Engine Oil Type:

2-stroke engine oil meeting specific JASO FD or similar API TC standards. Pre-mix ratio (e.g., 20:1, 32:1) specified.

Coolant Type:

Ethylene glycol-based, anti-freeze/anti-corrosion coolant. Capacity and type in manual.

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid (typically for front brake). Specified in manual.

Known Issues

Common Wear Items:

Clutch wear, exhaust valve (if equipped) carbon buildup, carburetor jetting issues, fork seal leaks, rear shock absorber wear.

Typical Troubleshooting Areas:

Starting difficulties (carburetor, ignition), poor running conditions (fuel/air mixture, exhaust port blockage), transmission engagement issues.

📚 Vehicle History

Brand Heritage

Yamaha Legacy:

Yamaha has a long-standing reputation for performance and reliability in motorcycles, particularly in off-road and dual-sport segments.

Model Evolution

Dt Series Evolution:

The DT series has a history dating back to the 1960s, evolving into capable dual-sport machines for various terrains. The 'R' designation often signifies a more performance-oriented or competition-inspired version.

Production

Production Period:

The DT125R was produced through the late 1980s and into the 1990s, with variations across different markets.

🏆 Awards & Recognition

Recognitions

Historical Accolades:

While specific 'awards' are not listed for this manual, the Yamaha DT series is recognized for its off-road capability and durability as a dual-sport platform.

Ratings

Manual Quality Rating:

High - described as comprehensive, accurate, and used by professionals.

Certifications

Certification:

N/A (Manuals are not certified in the same way vehicles or parts are.)