1989-1991 Yamaha YZ125W / YZ250W / YZ250WRW / YZ250B Service Manual
Diagnostic procedures and component service for Yamaha YZ125W, YZ250W, YZ250WRW, YZ250B models. Ref: LIT-11626-06-76, LIT-11626-06-91
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Sample pages from the 1989-1991 Yamaha YZ125W / YZ250W / YZ250WRW / YZ250B Service Manual manual
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Models Covered & Key Technical Specifications
Yamaha YZ125W / YZ250W / YZ250WRW / YZ250B (LIT-11626-06-76 / LIT-11626-06-91) -- 1989-1991
A Licensed Compendium | Volume.
- Reference Amperage Specs: 13A is set to the baseline electrical system capacity.
- Integral Thermal Envelope: For optimal performance, 20°C defines the standard operating temperature Range.
- General Production Rate: 175 pages -- signifies the comprehensive documentation provided.
- Essential Imaging Specs: The manual requires 150 MB for full download and access Logic.
- Baseline Fluid Capacity: Maximum throughput reaches 2.0 L when servicing the engine.
- Fundamental Output Rating: The cooling system produces 404 cm³ of coolant capacity Benchmarks.
Professional Workshop Service Manual & Technical Specifications
Professional Factory Technical Manual: Yamaha YZ125W YZ250W YZ250WRW YZ250B Motorcycle Owner's Service Manual 1989-1991 Hydraulic-Guide
Model-Designation: YZ125W / YZ250W / YZ250WRW / YZ250B LC // Engine-Type: Liquid-cooled 2-stroke, gasoline / System Logic // Conceptual-Layout: Disassembly and Reassembly Edition.
OEM guidelines are included for general motorcycle maintenance. Transmission service information covers gear ratios and operation. HVAC system procedures are included for engine cooling. Torque specifications are documented for critical engine and chassis components to ensure proper axial load stability. Parts identification is covered for all major assemblies and sub-assemblies.
Engine Systems Overview
This document details the engine, including cylinder head, piston, and related components. It also covers the primary drive gear and clutch mechanisms, kick axle and shift shaft, YPVS governor, CDI magneto, and engine removal and installation.
Chassis Procedures
Maintenance hierarchies are structured into front wheel, rear wheel, front brake, rear brake, front fork, steering, swingarm, and rear shock absorber systems. Procedures for removal, disassembly, and reassembly are included.
Technical Overview Table
| Integrated-Framework | Operational-Logic | Context |
|---|---|---|
| General Specifications | YZ250WRW | Dimensions, Weight, Engine Details |
| Maintenance Specifications | YZ250WRW | Cylinder, Piston, Crankshaft, Transmission Details |
| Chassis Specifications | YZ250WRW | Frame, Tires, Brakes, Suspension Details |
| Electrical Specifications | YZ250WRW | Ignition System, CDI, Coils |
| Torque Specifications | All Models | Fastener torque values for various components |
| Setting Parts | YZ125W/YZ250W | Carburetor, Sprocket, Suspension Settings |
Diagnostic and Repair Information
Logically requiring thorough inspection, this manual details carburetor and reed valve service, radiator and water pump maintenance, and crankcase and crankshaft procedures. It also includes transmission, shift cam, and shift fork system documentation.
Torque specifications are documented for primary drive gear and clutch components to ensure proper axial load stability.
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