Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991
Manual Preview
Sample pages from the Complete Yamaha YZ250B Owner's Service Manual Motorcycle 1991 manual
Purchase & Download
Models Covered & Key Technical Specifications
YZ250B / Yamaha
- Yamaha YZ250B (1991)
- Yamaha YZ250(B)/LC (1991)
- Yamaha YZ250 3XK1 (1991)
- Yamaha YZ250 3XK2 (1991)
- Yamaha YZ250 3XK4 (1991)
Professional Workshop Service Manual & Technical Specifications
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.
Manual Access & Delivery Information
FAQ
Customer Reviews
Read what our customers say about this Yamaha Bike manual and share your own experience.
Add a Review
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Reviews (2)