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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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Yamaha Models Covered & Key Technical Specifications

Models: Yamaha YZ250B
Sub-models / Variants: LC (Liquid Cooled), Europe, USA, Canada, Australia, New Zealand
Build Years: 1991
Serial Numbers: JYA3XKW0MA008101 (USA/Canada), JYA3XKT0MA019101 (Australia), 3XK-000101 (Europe), 3XK-008101 (Others), 3XK-019101 (Australia/New Zealand)
Technical Data:

  • Engine displacement: 249 cm³
  • Engine type: Liquid cooled, 2-stroke, single-cylinder
  • Compression ratio: 8.8–10.6:1
  • Transmission: 5-speed, constant mesh, wet multiple-disc clutch
  • Cylinder bore: 68.00–68.02 mm
  • Radiator capacity: 1.0 L
  • Cooling system pressure: 95–125 kPa
  • Ignition timing: 1.5 mm B.T.D.C. at 8,500 r/min
  • Spark plug: NGK B8EG
Technical Specifications
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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

Yamaha Manual Features & Content Preview

Inside the 1991 Yamaha YZ250B Owner's Service Manual

  • Covers the 1991 Yamaha YZ250B motocross machine, detailing technical specifications for engine, chassis, and electrical systems in international market variants
  • Original OEM publication P/N LIT-11626-07-56, 1st Edition, June 1990
  • Includes 15 detailed exploded-view assembly diagrams and 6 primary specification tables for tuning and maintenance
  • Accessible from your device as soon as the order is placed
  • File resolution preserves exploded-view detail for shop-floor reference
  • Indexed PDF search covers every chapter and appendix
  • This specific edition provides the factory-authorized setup parameters for the 3XK model range, serving as the primary documentation for 1991 racing configuration and engine maintenance

Manual Scope and Structure

This 1991 Yamaha YZ250B owner's service publication documents essential operational and inspection procedures for the YZ-series competition machine. Coverage encompasses seven distinct chapters, transitioning from general machine identification and tool requirements to detailed engine, chassis, and electrical diagnostic parameters. Every chapter provides a clear structural walkthrough, detailing disassembly, component inspection, and assembly data for the liquid-cooled, 2-stroke engine and multi-link monocross suspension.

Engine and Chassis Specifications

Technical information covers torque values, fluid capacities, and wear tolerances. The engine data section lists cylinder head warp limits at 0.03 mm and a cylinder bore standard of 68.00–68.02 mm. Transmission oil capacity for this model is documented at 0.75 liters. Electrical specifications detail CDI charging coil resistance at 36–54 ohms for the second coil circuit. Cylinder head nut torque is specified at 25 Nm in the engine data table. The front fork oil capacity for non-European models is 570 cm³ per unit. what an OEM service publication covers is vital for maintaining the 1991 Yamaha YZ250B engine integrity and suspension performance. An official 175-page Yamaha OEM workshop manual covering the 1991 Yamaha YZ250B, documenting engine, chassis, electrical, and fuel-injection specifications for the competition-focused 3XK-series build.

Manual FAQ, Purchase & Download Details

Are specification tables included that contain technical reference data for cylinder head warp limits and standard operation bore measurements? keyboard_arrow_down

Manual includes a dedicated specifications chapter that lists various technical limits and clearance values for key engine components. These tables are provided to reference factory-recommended operating standards for the YZ250B model.

Does this manual provide exploded views and component breakdown illustrations for the YPVS governor and other assemblies? keyboard_arrow_down

Yes, the manual contains numerous exploded diagrams that show component parts and their relative order for various assemblies throughout the motorcycle.

Can I find wiring diagrams or connector pinout references within the electrical sections of this service document? keyboard_arrow_down

Document includes an electrical chapter that covers various system components and their interconnections. It serves as a resource for viewing electrical system layouts and related technical reference information.

Is this document the official 1991 edition for the Yamaha YZ250B motorcycle? keyboard_arrow_down

Manual is identified as the first edition published in June 1990 for the 1991 Yamaha YZ250B, referenced by publication number LIT-11626-07-56.

What specific systems are covered in the engine, clutch, and transmission chapters of this 175-page manual? keyboard_arrow_down

Engine chapter covers a wide range of assemblies, including the cylinder head, piston, YPVS governor, and CDI magneto. It also includes dedicated sections for clutch and primary driven gear components, as well as transmission and crankcase arrangements. These chapters provide comprehensive documentation for the primary motorcycle systems.

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