1985 Yamaha YZ125N Owner's Service Manual

Documents YZ125N service procedures, including engine maintenance, electrical troubleshooting, and chassis repair. LIT-11626-04-78

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Document Details

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Document Number / Seller:
26553 / Amanda Jackson
File Size:
19.64 MB
File Type:
ZIP
Language:
English
Pages:
109
Printable:
Yes
Category:
Motorbike
Last updated / verified
Sep 27, 2025

Models Covered & Key Technical Specifications

Enhanced Engineering Service Manual: Motorbike Yamaha YZ125N manual, 1985 edition Diagnostic-Reference

Model-Portfolio: YZ125N / Yamaha Motor Corporation, Ltd // System-Identifier: Motorbike / Motorcycle Logic // System-Coverage: Technical Reference Data.

Integrated-Framework Baseline Framework
YZ125N Owner's Service Manual 1985 Edition

Engineering chapters address general information, regular maintenance and adjustments, engine maintenance and repair, chassis maintenance and repair, electrical troubleshooting, and appendices. This manual provides detailed diagrams and procedures for all systems.

Properly establishing the data for the engine systems is essential. This manual documents torque specifications for critical components to ensure proper thermal expansion compensation.

Documented Technical Data: 1200 dpi establishes the maximum print output Architecture. Technical Power Rating: For optimal operation, 450 W is rated at the active printing consumption Baseline. Universal Core Performance: The formatter board requires 64 MB for standard operation Requirements. Core Rated Tolerance Values: Maximum throughput reaches 25 ppm defines the environmental limit Threshold. Rated Principal Adjustment Range: The [Component] requires 6 Nm to specify the necessary clearance Mapping. Principal Tolerance Values: Maximum throughput reaches 25 ppm -- signifies the active printing consumption Configuration.

Professional Workshop Service Manual & Technical Specifications

Enhanced Engineering Service Manual: Motorbike Yamaha YZ125N manual, 1985 edition Diagnostic-Reference

Model-Portfolio: YZ125N / Yamaha Motor Corporation, Ltd // System-Identifier: Motorbike / Motorcycle Logic // System-Coverage: Technical Reference Data.

Testing requirements are specified for engine components and systems to ensure optimal performance. Proper maintenance and adjustments are crucial for longevity.

Clearance measurements are addressed for critical engine parts, ensuring proper operation and preventing premature wear.

Special procedures are addressed for electrical troubleshooting and system diagnostics, aiding in identifying and resolving issues.

Verification procedures are included for chassis components, including wheel assemblies, sprockets, chain, brakes, and suspension systems.

Repair information is provided for all major assemblies, from the engine to the electrical system, offering step-by-step guidance.

Integrated-Framework Baseline Framework
YZ125N Owner's Service Manual 1985 Edition
Part Number LIT-11626-04-78 File Size: 19.6426 MB
Engine Type Single Cylinder, Forward Inclined Displacement: 123 cm³

Engineering chapters address:

  • General Information (Page 1-1)
  • Regular Maintenance and Adjustments (Page 2-1)
  • Engine Maintenance and Repair (Page 3-1)
  • Chassis Maintenance and Repair (Page 4-1)
  • Electrical Troubleshooting (Page 5-1)

This comprehensive manual covers diagnostic procedures, component specifications, and repair techniques for the Yamaha YZ125N. It details the disassembly, inspection, repair, and reassembly of all major mechanical and electrical systems. Information on routine maintenance schedules, special tools, and troubleshooting guides are also included, ensuring a methodical approach to upkeep and repair.

The manual documents torque specifications for engine and chassis components to ensure proper thermal expansion compensation.

FAQ

Determine the **specific** torque specifications keyboard_arrow_down

80 N·m (8.0 m·kg, 58 ft·lb) is the specified torque for the primary drive gear and clutch locknut, ensuring secure assembly.

What specifications **designated** safety precautions keyboard_arrow_down

Always turn off the engine when refueling, keep gasoline spills away from the engine or exhaust pipe/muffler, and avoid touching hot engine or exhaust parts to prevent fires and burns.

Check the **critical** lubrication requirements keyboard_arrow_down

Lubricate pivot points, control cables, and the drive chain with high-quality, lightweight lithium-soap base grease, while using racing chain lube for the chain itself, to ensure smooth operation and prevent wear.

What does the **required** testing parameters keyboard_arrow_down

The CDI magneto source coil resistance is 1,437Ω ± 10% at 20°C (68°F), and the pickup coil resistance is 433Ω ± 10% at 20°C (68°F) for proper ignition system function.

Reference the **specified** diagnostic procedures keyboard_arrow_down

Pages 92+ details diagnostic procedures for engine hard-start or no-start conditions, including checks for ignition system issues, compression, and air/fuel systems, with specific remedies listed.

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This manual is incredibly detailed and helped me with my bike's maintenance. The download process was smooth and the email response was quick!
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I had a few questions about the manual, and the support team responded almost immediately. Download was seamless too!
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Rated 4 out of 5 stars
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The manual is very thorough, and I appreciated the quick email support when I needed some clarification. Downloading was hassle-free!
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Rated 4 out of 5 stars