1991 Yamaha YZ125B Owner's Service Manual

1991 YZ125B owners service manual - contains repair, adjustment, and inspection procedures for all major components, including engine, chassis, and electrical systems. Part number LIT-11626-07-55.

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Document Details

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Document Number / Seller:
26554 / Christopher Garcia
File Size:
35.99 MB
File Type:
ZIP
Language:
English
Pages:
175
Printable:
Yes
Category:
Bike
Last updated / verified
Dec 30, 2025

Models Covered & Key Technical Specifications

Consolidated Configuration Electrical Manual: Bike Yamaha YZ125B motorcycle owner's service manual: 1991 repair guide Workshop-Compendium Bike Yamaha YZ125B (Part Number: LIT-11626-07-55) -- 1991 Strategic Specification Registry | Toolkit.

  • Published Heat Tolerance: 564 cm³ relates to the total front fork fluid capacity Standards.
  • Measured Output Performance: 2.165 mm defines the overall extended length of the motorcycle Matrix.
  • Approved Mass Specs: 95 kg is the basic weight of the motorcycle for optimal handling Topology.
  • Reference Output Density: 100 kPa signifies the maximum cold tire pressure for safe operation Margin.
  • Fundamental Capacity Limits: 8.0 L specifies the total fuel tank capacity Protocol.
  • Universal Operating Temps: 2,165 mm describes the overall length of the motorcycle Parameters.

Professional Workshop Service Manual & Technical Specifications

Consolidated Configuration Electrical Manual: Bike Yamaha YZ125B motorcycle owner's service manual: 1991 repair guide Workshop-Compendium

Bike Yamaha YZ125B (Part Number: LIT-11626-07-55) // Engineering-Metrics: 1991 YZ125B motorcycle owner's service manual / Bike motorcycle Logic // Asset-ID: 175 pages. Technical-details.

Assessment-Parameter Diagnostic-Logic Calibration-Spec
General Information This manual includes basic operation, maintenance, and inspection data. 175 pages
Engine Specifications Covers engine disassembly, assembly, and tuning procedures. 124 cc
Chassis Components Details front and rear suspension, wheels, and brake systems. N/A
Electrical System Includes ignition system, CDI, and wiring diagrams. Complete Diagrams
Maintenance Schedule Outlines regular inspection and service intervals. Every 3,000 miles

Cataloging major assemblies into specific sections for clarity. This document is designed to provide a thorough understanding of the machine's systems and procedures. It covers detailed information on all major components, including disassembly, assembly, and inspection. The manual also includes essential diagnostic procedures and specifications required for proper maintenance.

Reference data is included for

the assembly and installation of critical engine components. This section details procedures for the cylinder head, cylinder, piston, crankshaft, and transmission, ensuring correct reassembly and optimal performance.

This manual covers

the inspection and maintenance of the chassis and suspension systems. It provides detailed steps for front and rear fork service, shock absorber adjustments, and wheel bearing maintenance to ensure optimal handling and ride comfort.

Diagnostic procedures are covered for

all electrical components, including the ignition system, CDI unit, and wiring diagrams. These procedures help in troubleshooting and repairing any electrical issues, ensuring the bike's reliable operation.

This document details torque specifications for various components to ensure proper bolt stretch prevention and secure assembly.

FAQ

What are the **proper** clearance measurements for the YZ125B? keyboard_arrow_down

0.040-0.045 mm (0.0016-0.0018 in) is the standard piston clearance measurement for the YZ125B, with an out-of-round limit of 0.004 inches.

Specify the **standard** torque specifications for the YZ125B. keyboard_arrow_down

55 Nm (5.5 m•kg, 40 ft•lb) is the torque specification for the primary drive gear bolt on the YZ125B.

What is the **necessary** safety precautions when working on the YZ125B? keyboard_arrow_down

Never attempt to operate the machine until you have attained a satisfactory knowledge of its controls and operating features. Always wear protective apparel, including an approved helmet with goggles or a face shield, heavy boots, gloves, and protective clothing. Ensure that no clothing will get caught in moving parts or controls of the machine.

Calculate the **recommended** lubrication requirements for the YZ125B. keyboard_arrow_down

YAMALUBE "R" (24 : 1 mixing ratio) is the recommended oil for the fuel mixture, with a fuel tank capacity of 8.0 L (1.76 Imp gal, 2.11 US gal).

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Reviews (2)

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The manual is incredibly detailed and easy to follow. I appreciated the quick email response with my download link. Very smooth process!
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This service manual has everything you need for the YZ125B. The download was seamless, and the support team was very helpful when I had questions. Highly recommend!