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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Document Details

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Document Number / Seller:
26560 / Lisa Smith
File Size:
27.62 MB
File Type:
ZIP
Language:
English
Pages:
175
Printable:
Yes
Category:
Bike
Last updated / verified
Dec 29, 2025

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.

Professional Workshop Service Manual & Technical Specifications

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

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

0.03 mm (0.0012 in) is the cylinder head warp limit, and 68.00–68.02 mm is the standard cylinder bore measurement.

Specify the **standard** torque specifications. keyboard_arrow_down

12 Nm (8.7 ft-lb) is the standard torque for the crankcase cover 3, and 75 Nm (7.5 m•kg, 54 ft•lb) for the nut (drive sprocket).

What is the **necessary** safety precautions? keyboard_arrow_down

Always wear protective apparel, including a helmet, goggles, gloves, and proper fitting clothing. Ensure the machine is properly maintained and never attempt to operate it at maximum power until experienced.

Calculate the **recommended** lubrication requirements. keyboard_arrow_down

For engine oil, Yamalube 4 (10W-30) or SAE 10W30 SE motor oil is recommended, with a mixing ratio of 24:1 for premium unleaded fuel.

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Rated 4 out of 5 stars
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This manual is a must-have for anyone with a 1991 YZ250B! The download process was super smooth, and I received the link within minutes. Highly recommend!