Target Audience:
Owners of Yamaha DT125R (1987-1988), independent mechanics, enthusiasts seeking to maintain or repair their motorcycle.
Value Proposition:
Provides dealership-level repair information, enabling significant cost savings on maintenance and repairs.
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.
Primary Coverage:
Service, Repair, Workshop
Scope:
Comprehensive for 1987-1988 Yamaha DT125R models
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.
Type:
Service Repair Workshop Manual
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
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.
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.
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
Horsepower:
Typically around 15-20 HP depending on specific market regulations. Exact figures in manual.
Torque:
Specific figures available within the manual.
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).
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).
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 Ratings:
N/A (Motorcycle safety ratings are not typically standardized like automotive crash tests).
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.
Infotainment System:
N/A (This is a 1980s dual-sport motorcycle, no advanced infotainment features.)
Driver Assistance Systems:
N/A (No electronic driver assistance systems.)
Connectivity Features:
N/A (No electronic connectivity features.)
Headlight Type:
Halogen (typical for the era). Bulb specifications in manual.
Taillight Type:
Incandescent bulb. Bulb specifications in manual.
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.
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.
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.
Yamaha Legacy:
Yamaha has a long-standing reputation for performance and reliability in motorcycles, particularly in off-road and dual-sport segments.
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 Period:
The DT125R was produced through the late 1980s and into the 1990s, with variations across different markets.
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.
Manual Quality Rating:
High - described as comprehensive, accurate, and used by professionals.
Certification:
N/A (Manuals are not certified in the same way vehicles or parts are.)
