Yamaha YZ125W YZ250W YZ250WRW YZ250B LC Motorcycle Owner's Service Manual 1989-1991
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Sample pages from the Yamaha YZ125W YZ250W YZ250WRW YZ250B LC Motorcycle Owner's Service Manual 1989-1991 manual
Purchase Information
1989-1991 Yamaha YZ125W YZ250W YZ250WRW YZ250B Owner's Service Manual - Technical Specifications
- Document Number / Seller:
- 24741 / Andrew Rogers
- File Size:
- 80.97 MB
- File Type:
- ZIP
- Language:
- English (some of our manuals are multi-language)
- Pages:
- 175
- Printable:
- Yes
- Estimated Download Time:
- 1.66 Minutes
- Delivery Format:
- Digital (PDF) - Instant Access
- Category:
- Bike
- Brand:
- Yamaha
- Reviewed and Approved:
- Dec 24, 2025
Yamaha Models and Parts Covered in this Bike Manual
YZ250W / Yamaha Motor Co., Ltd
- YZ125W (1989)
- YZ250W (1989)
- YZ250WRW (1989)
- YZ250B / LC (1990-1991)
Complete Manual Information
Yamaha YZ125W YZ250W YZ250WRW YZ250B Motorcycle Owner's Service Manual 1989-1991
Master your machine with the definitive factory repair resource for the 1989-1991 Yamaha YZ series. This comprehensive collection covers the iconic W and B series, including the specialized WR (Wide Ratio) off-road version. Whether you are performing a routine top-end rebuild on your YZ125W or a full transmission overhaul on the YZ250B, these documents provide the exact factory specifications and step-by-step procedures required for professional results.
Model Identification and Serial Numbers
Positive identification is crucial for ordering correct parts and technical accuracy. This manual covers the following series with these starting serial numbers:
- YZ125W (1989): Starting Frame Serial JYA3JDWOKA000101 / Engine 3JD-000101
- YZ250W (1989): Starting Frame Serial JYA3JEWOKA000101 / Engine 3JE-000101
- YZ250WRW (1989): Starting Frame Serial JYA3RBW0*KA000101 / Engine 3RB-000101
- YZ250B / LC (1990-1991): Starting Frame Serial 3XK-008101 (USA/Others) / Engine 3XK-008101
Detailed Table of Contents
General Information
- Machine Identification and Serial Number Locations
- Technical Specifications and Dimensions
- Safety Precautions and Fuel/Oil Requirements
- Special Tool Requirements for Engine and Chassis
Periodic Inspection and Adjustment
- Maintenance Interval Schedules
- Cooling System Inspection and Coolant Replacement
- Clutch and Throttle Cable Adjustments
- Air Filter Cleaning and Transmission Oil Checks
- Brake System Air Bleeding and Pad Inspection
- Drive Chain Slack Adjustment and Sprocket Care
- Suspension Tuning: Compression and Rebound Damping
Engine Overhaul and Service
- Cylinder Head, Cylinder, and Piston Removal
- Power Valve (YPVS) Disassembly and Cleaning
- Piston Ring and Piston Clearance Inspection
- Clutch Boss and Friction Plate Service
- Kick Axle and Shift Shaft Procedures
- CDI Magneto and Rotor Removal
- Crankcase Splitting and Crankshaft Assembly
- Transmission, Shift Cam, and Shift Fork Installation
Cooling System
- Radiator Maintenance and Inspection
- Water Pump Impeller and Oil Seal Replacement
Carburetion
- Mikuni TM38SS Carburetor Cleaning and Adjustment
- Float Level Height Specifications
- Reed Valve Inspection and Cleaning
Chassis and Suspension
- Front Fork Disassembly and Oil Level Adjustment
- Rear Shock Absorber Spring Preload and Disposal
- Steering Head Bearing Adjustment
- Swingarm and Relay Arm Service
- Front and Rear Disc Brake Caliper Overhaul
Electrical System
- Ignition System Troubleshooting
- CDI Unit and Ignition Coil Testing
- Full Wiring Diagrams and Cable Routing
Appendices
- General Torque Specifications
- Service Data and Wear Limits
- Setting Parts (Jets and Sprockets)
Model Highlights and Value for Owners
The 1989-1991 period represented a peak in Yamaha's 2-stroke development. This manual provides the specific "Disassembly and Reassembly" editions combined with "Operation and Tuning" guides, ensuring you have both the "how-to" and the "why" for your bike's performance.
- YZ250WRW Specialist Info: The Wide Ratio (WR) model features specialized gear ratios (1st: 2.285 to 5th: 0.840) and a larger fuel capacity, all detailed in this manual.
- YPVS System: Get precise instructions on the Yamaha Power Valve System to ensure your engine maintains its legendary powerband.
- Suspension Mastery: Step-by-step fork and shock service for the 41mm inverted tubes and Monoshock rear end, including standard spring rates (K=3.80 Nm for YZ250W).
This manual is optimized for mobile viewing, allowing you to access torque specs and exploded diagrams directly at your workbench. Stop guessing and start wrenching with factory-level precision.
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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 Yamaha YZ125W YZ250W YZ250WRW YZ250B LC Motorcycle Owner's Service Manual 1989-1991. It includes information for the following models: **YZ250W / Yamaha Motor Co., Ltd** - YZ125W (1989) - YZ250W (1989) - YZ250WRW (1989) - YZ250B / LC (1990-1991).
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 (80.97 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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