1991 Yamaha YZ250B Owner's Service Manual Motorcycle
Technician-level documentation for the Yamaha YZ250B—covering engine, chassis, electrical, and tuning systems. PN LIT-11626-07-56.
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Models Covered & Key Technical Specifications
Yamaha YZ250B (LIT-11626-07-56) – 1991 Complete Yamaha YZ250B Owner's Service Manual Motorcycle | Series Yamaha Motorcycle. Dossier
- Principal Assembly Gap: 0.03 mm (0.0012 in) establishes the maximum cylinder head warp limit.
- Defined Load Capacity: For optimal operation, 88 kg (194 lb) defines the minimum weight for class 125 cc machines.
- General Size Parameters: 249 cm³ (8.42 US oz) defines the engine displacement for the YZ250B.
- Advanced Running Clearance: The cylinder bore requires 68.00–68.02 mm for standard operation.
- Defined Fastening Values: 12 Nm (8.7 ft-lb) is set to the torque value for the crankcase cover 3.
- General Thermal Envelope: 32 mm (1.26 in) is the standard thickness for the radiator Core.
Manual Description & Preview
Definitive Calibration Repair Manual: Bike Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991 Calibration-Manual
System-Identifier: YZ250B / Yamaha (LIT-11626-07-56) // Year-Coverage: 1991 // Operational-Scope: Motorcycle Logic.
| Identifier | System-Path | Calibration-Spec |
|---|---|---|
| Model Code Number | YZ250(B)/LC | 3XK1 (EUROPE) |
| Vehicle Identification Number | JYA3XKW0*MA008101 (USA, CDN) | JYA3XKTO*MA019101 (AUS) |
| Engine Starting Number | 3XK-000101 (EUROPE) | 3XK-008101 (USA, CDN, OTHERS) |
Service procedures are documented for the engine, chassis, and electrical systems. Calibration requirements are specified for all major components, including the carburetor, front fork, and rear shock absorber. Electrical system documentation covers ignition and lighting. Suspension service documentation includes fork and shock adjustments. Disassembly instructions are documented for the entire motorcycle.
Systems
This manual documents the systems of the Yamaha YZ250B, including the engine, transmission, fuel, and lubrication systems. It details the procedures for their inspection, adjustment, and repair. Careful attention is given to the correct assembly of complex components.
Specifications
Technical specifications are included for all major components. This manual documents torque specifications for critical fasteners to ensure proper bolt stretch prevention and mechanical integrity.
Introduction
This manual provides a comprehensive overview of the Yamaha YZ250B's features and operation. It is intended for use by technicians and experienced owners.
Procedures
The manual details various service procedures, such as carburetor tuning, suspension adjustments, and electrical system diagnostics.
FAQ
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