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Yamaha DT125 DT125R 1987 1988 Workshop Service Repair Manual PDF Download
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Basic Information Identification Make: Yamaha Model: DT125 / DT125R Years Covered: 1987, 1988 Codes Engine Code Indicator: DT125, DT125R Introduction Market Position Vehicle Segment: Lightweight Dual-Sport / Enduro Motorcycle Competitive...
Type: Motorcycles
Vendor:
Sku: 50992
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| Basic Information | |
| Identification | |
| Make: | Yamaha |
| Model: | DT125 / DT125R |
| Years Covered: | 1987, 1988 |
| Codes | |
| Engine Code Indicator: | DT125, DT125R |
| Introduction | |
| Market Position | |
| Vehicle Segment: | Lightweight Dual-Sport / Enduro Motorcycle |
| Competitive Analysis | |
| Key Competitors Era: | Honda CR125R, Kawasaki KX125, Suzuki RM125 (motocross variants); various enduro machines. |
| Key Features | |
| Dt125R Reputation: | Known for its reliability, off-road capability, and relatively simple yet effective two-stroke engine. |
| Manual Utility | |
| Value Proposition: | Essential resource for owners and mechanics to maintain and repair the DT125/DT125R, ensuring longevity and optimal performance. |
| Manual Details | |
| Coverage Areas | |
| Manual Scope: | Workshop Service Repair |
| Page Count | |
| Estimated Pages: | Hundreds (as per description) |
| Manual Type | |
| Manual Classification: | Factory Official Full Service Repair Manual |
| Language | |
| Primary Language: | English |
| Format | |
| Delivery Format: | PDF Download |
| Manual Coverage | |
| Systems Covered | |
| Engine System: | Complete overhaul, diagnostics, tuning, lubrication, cooling, exhaust. |
| Fuel System: | Carburetor identification, adjustment, cleaning, fuel tank, fuel lines, petcock. |
| Transmission System: | Gearbox operation, clutch, shift mechanism, lubrication, repair procedures. |
| Chassis Frame: | Frame inspection, alignment, swingarm, pivot bearings, steering head bearings. |
| Suspension Front: | Front fork disassembly, assembly, oil change, seal replacement, spring rates. |
| Brakes Front: | Disc brake caliper servicing, hydraulic lines, master cylinder, pad replacement, bleeding. |
| Electrical System: | Ignition system, lighting, charging system (stator, regulator/rectifier), battery, wiring diagrams. |
| Cooling System: | Air cooling (fins), component checks. |
| Exhaust System: | Muffler, pipe inspection, sealing. |
| Wheels Tires: | Wheel bearing maintenance, spoke tensioning, tire pressure specifications. |
| Bodywork Plastics: | Fairing, fenders, seat, fuel tank removal and installation. |
| Suspension Rear | |
| Rear Shock ABSorber: | Monoshock unit service, linkage maintenance, damping adjustments. |
| Brakes Rear | |
| Rear Brake System: | Drum brake inspection, adjustment, shoe replacement. |
| Procedures Included | |
| Routine Maintenance: | Oil changes, filter replacements, chain adjustment, spark plug checks, air filter cleaning. |
| Engine Rebuild: | Top-end overhaul, piston, rings, cylinder, crankshaft service. |
| Carburetor Tuning: | Jetting, idle speed, mixture adjustments for optimal performance. |
| Troubleshooting Diagnostics: | Systematic fault finding for common and complex issues. |
| Wiring Diagrams: | Detailed electrical schematics for accurate diagnosis and repair. |
| Component Disassembly Assembly: | Step-by-step guides for all major motorcycle components. |
| Technical Depth | |
| Diagnostic Capability: | Advanced diagnostics and troubleshooting for intricate issues. |
| Repair Complexity: | Covers everything from basic adjustments to complete engine and chassis overhauls. |
| Completeness: | Full factory specification for comprehensive repair and maintenance. |
| Manual Specifications | |
| File Format | |
| Document Format: | |
| Print Quality | |
| Digital Resolution: | High resolution, suitable for printing. |
| Binding Type | |
| Digital Print Option: | Printable in its entirety or specific sections. |
| Paper Type | |
| Digital Paper Equivalent: | N/A (Digital File) |
| Engine Specifications | |
| Primary Engine | |
| Engine Type: | Two-Stroke, Single-Cylinder |
| Displacement: | 123 cc (7.5 cubic inches) |
| Bore X Stroke: | 56.4 mm x 50.0 mm (approximate) |
| Compression Ratio: | Approx. 7.2:1 (varies slightly by model revision) |
| Cooling System: | Forced Air Cooling |
| Ignition System: | CDI (Capacitor Discharge Ignition) |
| Spark Plug Type: | NGK B8ES (or equivalent, consult manual for specific) |
| Performance | |
| Horsepower Estimated: | Approx. 17-20 HP (at crankshaft, varies by market and tuning) |
| Torque Estimated: | Approx. 14-16 Nm (at crankshaft, varies by market and tuning) |
| Fuel System | |
| Carburetor Model: | Mikuni VM26SS (typical for this era) |
| Fuel Type: | Unleaded Gasoline (min. 91 RON / 87 AKI recommended) |
| Oil Mixture Ratio: | 50:1 (2-stroke oil to gasoline in the oil injection system) |
| Transmission | |
| Standard | |
| Transmission Type: | 6-Speed Constant Mesh |
| Features | |
| Clutch Type: | Wet, Multi-Plate |
| Final Drive: | Chain Drive (O-ring sealed type typical) |
| Dimensions | |
| Exterior | |
| Overall Length: | Varies by specific model variant, consult manual for exact figures. |
| Weights | |
| Dry Weight Estimated: | Approx. 100-110 kg (220-242 lbs) |
| Fuel Tank Capacity: | Approx. 9.5 - 10.5 Liters (2.5 - 2.8 Gallons) |
| Safety Features | |
| Ratings | |
| Crash Safety Standards: | N/A (Motorcycle, not subjected to automotive crash ratings) |
| Active Features | |
| Braking System: | Front Disc Brake, Rear Drum Brake for effective stopping power. |
| Passive Features | |
| Frame Construction: | Steel Frame providing structural integrity. |
| Technology Features | |
| Infotainment | |
| Instrument Cluster: | Analog speedometer, tachometer, and basic indicator lights (neutral, turn signals, high beam). |
| Driver Assistance | |
| ABS Availability: | Not equipped with ABS. |
| Connectivity | |
| Connectivity Features: | N/A (No modern electronic connectivity features). |
| Maintenance | |
| Service Intervals | |
| Engine Oil Change: | Refer to manual; typically every 2,000-3,000 km or annually. Crankcase oil change is crucial. |
| Air Filter Cleaning: | Check and clean every 1,000-2,000 km, especially in dusty conditions. |
| Chain Lubrication Adjustment: | Lubricate every 500 km, adjust tension as needed according to manual specifications. |
| Spark Plug Service: | Inspect and clean/gap every 3,000-4,000 km, replace as necessary. |
| Fluid Specifications | |
| Transmission Oil Type: | Yamaha Gear Oil 10W-30 (or equivalent API GL-4 specification) |
| Fork Oil Type: | Yamaha Fork Oil G10 (or equivalent SAE 10W) |
| Brake Fluid Type: | DOT 3 or DOT 4 Hydraulic Brake Fluid |
| Known Issues | |
| Common Wear Items: | Piston rings, crankshaft seals, clutch plates, and suspension seals are common wear items on high-mileage units. |
| Carburetor Performance: | Carburetors can be sensitive to altitude and air filter condition; regular cleaning and tuning are beneficial. |
| Electrical Reliability: | Older wiring harnesses can develop corrosion or damage, affecting ignition or charging systems. Manual is key for troubleshooting. |
| Vehicle History | |
| Brand Heritage | |
| Yamaha Motorcycle Legacy: | Yamaha has a long history of producing reliable and performance-oriented motorcycles, particularly in the off-road and dual-sport categories. |
| Model Evolution | |
| Dt Series Development: | The DT series originated in the late 1960s and evolved through various displacements and configurations, emphasizing versatility and durability. |
| Production | |
| Manufacturing Location Typical: | Japan (primary manufacturing hub for Yamaha at this time) |
| Production Years Model | |
| Dt125R Production Span: | Covered years 1987-1988, part of a continuous DT125 lineage. |
| Awards & Recognition | |
| Recognitions | |
| Model Reputation: | Praised for its robustness and ability to handle diverse terrain, a popular choice for adventure and trail riding. |
| Ratings | |
| Consumer Ratings Historical: | Generally well-regarded for reliability and ease of maintenance by owners of the era. |