Target Audience:
Do-it-yourselfers and experienced mechanics alike.
Value Proposition:
Inexpensive way to keep the vehicle working properly, comprehensive information.
Detail Level:
Hundreds of pages with detailed substeps, notes, cautions, warnings, and hundreds of photos/illustrations.
Navigation:
Numbered table of contents for quick information retrieval.
Engine Mechanical:
Complete disassembly and reassembly instructions for engine components.
Engine Tuning:
Carburetor adjustment, ignition timing, and performance tuning guidelines.
Transmission Operation:
Details on gearbox components, clutch, and shifting mechanisms.
Electrical Diagnostics:
In-depth troubleshooting for lighting, ignition, charging, and starter systems.
Suspension And Steering:
Fork servicing, shock absorber adjustments, and steering head bearing maintenance.
Braking System:
Hydraulic brake component servicing, bleeding procedures, and pad replacement.
Fuel And Emission Control:
Carburetor service, fuel lines, and basic emission control system information.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, spark plug checks.
Major Repairs:
Engine rebuilds, transmission overhauls, and suspension component replacement.
Troubleshooting Guides:
Step-by-step diagnostic procedures for common and complex issues.
Wiring Diagrams:
Detailed electrical schematics for all vehicle systems.
Torque Specifications:
Precise torque values for all critical fasteners.
Special Tool Requirements:
Identification of specialized tools needed for specific procedures.
Depth:
Comprehensive factory-level detail suitable for both DIY enthusiasts and professional mechanics.
Compatibility:
All PC-based Windows operating systems and Mac.
Printability:
Printable without any restriction, entire manual or specific pages.
Binding:
N/A (Digital Download)
Paper Type:
N/A (Digital Download)
Searchability:
Implied (standard for PDF, beneficial for quick reference)
Delivery:
Instant download link on checkout page post-payment.
Reader Requirement:
Adobe PDF Reader
Type:
2-stroke, Liquid-cooled, Reed valve, YPVS (Yamaha Power Valve System)
Displacement:
124 cc (approximate)
Horsepower Estimate:
Typically around 20-25 HP (varies by specific model variant and tuning)
Torque Estimate:
Approximately 1.5 - 1.8 kgf-m (varies by specific model variant and tuning)
Carburetion:
Mikuni VM series (e.g., VM28SS on some variants)
Fuel Type:
Unleaded gasoline (recommendation usually 91 octane or higher)
Oil System:
Autolube system (premix oil injected into fuel)
Length Estimate:
Varies by model variant, typically around 2000-2100 mm
Width Estimate:
Varies by model variant, typically around 800-850 mm
Height Estimate:
Varies by model variant, typically around 1100-1200 mm
Dry Weight Estimate:
Around 100-110 kg (varies by model variant)
Fuel Tank Capacity Estimate:
Approximately 9-11 liters
Safety Standards:
Manual covers safe operating procedures and maintenance for safety compliance.
Braking System:
Front and rear disc brakes on most variants (DT125X typically front and rear disc).
Lighting System:
Headlight, taillight, brake light, turn signals (coverage in electrical section).
Oil Change Engine:
Refer to manual for specific recommendations based on usage (typically every few thousand kilometers or annually).
Spark Plug Inspection:
Regular inspection and cleaning/replacement intervals detailed in the manual.
Chain Lubrication Adjustment:
Recommended intervals for cleaning, lubricating, and adjusting chain tension.
Engine Oil Type:
Yamaha recommends specific 2-stroke oil (Autolube oil). Refer to manual for exact specifications (e.g., JASO FD or FC).
Transmission Oil:
Yamalube Gear Oil or equivalent SAE 80W API GL-4 or GL-5.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Coolant Type:
Ethylene glycol-based permanent type antifreeze coolant, mixed with distilled water (50:50 ratio).
Carburetor Fouling:
Common with 2-stroke engines; requires regular cleaning and proper jetting.
Ypvs System Issues:
Carbon buildup can affect performance; requires periodic cleaning and inspection of the power valve mechanism.
Clutch Wear:
Clutch plates can wear over time, requiring replacement as per manual guidelines.
Suspension Leaks:
Fork seals and rear shock seals can degrade, leading to oil leaks.
Yamaha Legacy:
Yamaha has a long history of producing reliable and performance-oriented off-road and dual-sport motorcycles.
Dt Series Significance:
The DT series has been a staple for Yamaha, known for its versatility and durability, evolving from simple enduro bikes to more refined dual-sport models.
Production Period:
The DT125 model line has had a long production run spanning several decades, with various iterations and updates.
