Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991
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Sample pages from the Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991 manual
Purchase Information
1991 Yamaha YZ250B owner´s service manual - Technical Specifications
- Document Number / Seller:
- 26560 / Lisa Smith
- File Size:
- 27.62 MB
- File Type:
- ZIP
- Language:
- English
- Pages:
- 175
- Printable:
- Yes
- Estimated Download Time:
- 0.57 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Bike
- Brand:
- Yamaha
- Reviewed and Approved:
- Dec 29, 2025
Yamaha Models and Parts Covered in this Bike Manual
YZ250B / Yamaha
- Yamaha YZ250B (1991)
- Yamaha YZ250(B)/LC (1991)
- Yamaha YZ250 3XK1 (1991)
- Yamaha YZ250 3XK2 (1991)
- Yamaha YZ250 3XK4 (1991)
Complete Manual Information
Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991
Master your machine with the definitive 175-page professional-grade repair resource. This isn't just a basic manual; it is the official June 1990 first edition "Owner's Service Manual" (Part No. LIT-11626-07-56), specifically engineered for the legendary 1991 YZ250B competition series. Whether you are performing a simple trackside adjustment or a full engine rebuild, this document provides the exact factory-spec information used by professional Yamaha technicians.
Designed for peak performance in closed-course competition, this manual covers the high-performance liquid-cooled 2-stroke single-cylinder engine that defined an era of motocross. From precision carburetor jetting for the Mikuni TM38SS to the intricate YPVS (Yamaha Power Valve System) governor settings, every technical detail is included to keep your bike at the front of the pack.
Comprehensive Model Coverage
This manual is the primary technical authority for the following 1991 model year combinations:
- Yamaha YZ250B (1991)
- Yamaha YZ250(B)/LC (1991)
- Yamaha YZ250 3XK1 (Europe)
- Yamaha YZ250 3XK2 (USA, Canada, Others)
- Yamaha YZ250 3XK4 (Australia, New Zealand)
Exact Machine Identification & Serial Numbers
For accurate parts ordering and positive identification, this manual covers the following serial number ranges:
- Vehicle Identification Number (VIN):
- USA/Canada: Starting at JYA3XKW0MA008101
- Australia: Starting at JYA3XKTOMA019101
- Frame Serial Numbers:
- Europe: 3XK-000101
- NZ: 3XK-019101
- Others: 3XK-008101
- Engine Serial Numbers:
- Starting at 3XK-000101 (Europe), 3XK-008101 (USA/Canada), or 3XK-019101 (AUS/NZ).
Inside This Expert Guide
This manual is organized into seven deep-dive chapters for intuitive navigation:
- General Information: Detailed machine descriptions, control functions, and a vital pre-operation checklist.
- Specifications: Every torque value, maintenance limit, and capacity (e.g., 1.0L cooling system, 0.75L transmission oil periodic change).
- Periodic Inspections & Adjustments: Pro-level maintenance schedules, from brake bleeding to ignition timing checks using dial gauges.
- Engine Overhaul: Step-by-step procedures for the liquid-cooled 249cc powerplant, including YPVS servicing, crankshaft installation, and clutch replacement.
- Chassis & Suspension: Full service for the telescopic front forks (43mm diameter) and the Link Type Monocross rear suspension.
- Electrical System: Detailed CDI Magneto (3SP Yamaha) testing and ignition system troubleshooting.
- Tuning for Results: Expert-level sections on carburetor jetting, gearing ratios, and suspension damping adjustments for different track conditions.
Essential Technical Data
- Engine Type: Liquid-cooled 2-stroke, forward-inclined single cylinder.
- Bore x Stroke: 68.0 x 68.8 mm.
- Carburetor: Mikuni TM38SS (I.D. Mark 3XK10 for USA).
- Ignition Timing: 1.5 mm (0.059 in) B.T.D.C.
- Fuel/Oil Ratio: 24:1 using Yamalube "R" (or 20:1 for Castrol R30/A747).
Why This Manual is Indispensable
Unlike generic guides, this manual contains the high-resolution "Illustrated Symbols" and sequential step-by-step instructions that prevent costly mistakes. It includes specific "Removal Points" that explain hidden nuances, such as inserting the set pin to remove the power valve nut or the exact sequence for tightening the handlebar upper holders.
The pricing of this manual is determined by the seller and may vary. Please compare before purchase and check user reviews. We offer a lifetime guarantee for your download, ensuring your technical library is always accessible when you are in the garage or at the track.
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Frequently Asked Questions - Yamaha Bike Manual
What does this Yamaha manual cover?
This comprehensive service manual covers detailed repair procedures, maintenance schedules, troubleshooting guides, and technical specifications for Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991. It includes information for the following models: **YZ250B / Yamaha** - Yamaha YZ250B (1991) - Yamaha YZ250(B)/LC (1991) - Yamaha YZ250 3XK1 (1991) - Yamaha YZ250 3XK2 (1991) - Yamaha YZ250 3XK4 (1991).
Is this manual suitable for beginners?
Yes, this Yamaha manual is designed for both professional technicians and DIY enthusiasts. It includes step-by-step procedures with clear illustrations and safety guidelines for Bike maintenance and repair.
What file format will I receive?
You will receive this manual as a ZIP file (27.62 MB), which is compatible with all devices. The manual is fully searchable and printable for your convenience.
How quickly can I access the manual after purchase?
You'll receive instant access to your Yamaha Bike manual immediately after payment completion. The download link is valid for 3 days, with lifetime re-download guarantee.
Can I print specific sections of the manual?
Absolutely! This digital manual allows you to print any section you need, from individual pages to complete chapters, making it perfect for workshop use.
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