Introduction to Your Workshop Manual
This comprehensive owner's workshop manual provides detailed service and repair information for BMW Twins motorcycles produced between 1970 and 1988. It covers a wide range of engine displacements, including 473cc, 490cc, 599cc, 649cc, 745cc, 797cc, 898cc, and 979cc models.
Designed for both the professional mechanic and the DIY enthusiast, this manual offers step-by-step procedures, detailed illustrations, and wiring diagrams to assist in all aspects of motorcycle maintenance and repair.
Image: Front cover of the BMW Twins 1970-88 Owner's Workshop Manual. The cover features a blue background with the "BMW Twins" title and a prominent image of a black and yellow BMW motorcycle, likely an R80GS or similar model from the era, indicating the manual's focus on these classic machines.
How to Use This Manual
To get the most out of this workshop manual, it is recommended to familiarize yourself with its structure. Chapters are organized by specific motorcycle systems (e.g., Engine, Fuel System, Electrical System, Brakes). Each procedure is clearly outlined with accompanying photographs or diagrams.
- Safety First: Always read the safety warnings and precautions at the beginning of each relevant section before commencing any work.
- Tools and Equipment: Ensure you have the necessary tools and equipment as specified for each task.
- Step-by-Step Instructions: Follow the instructions sequentially. Do not skip steps.
- Torque Specifications: Pay close attention to all specified torque values for fasteners to prevent damage.
Understanding Your BMW Twin's Systems
This manual provides in-depth information on the various systems of your BMW Twin motorcycle, crucial for effective maintenance and repair. Key systems covered include:
- Engine: Detailed procedures for engine overhaul, cylinder head service, valve adjustment, and piston/cylinder inspection.
- Fuel and Exhaust Systems: Carburetor synchronization, fuel line inspection, air filter maintenance, and exhaust system repair.
- Clutch and Transmission: Clutch adjustment, replacement, and transmission disassembly/assembly.
- Drive Shaft and Final Drive: Maintenance and repair of the shaft drive system, a hallmark of BMW Twins.
- Brakes, Wheels, and Tires: Brake pad replacement, fluid bleeding, wheel bearing inspection, and tire considerations.
- Suspension and Steering: Fork oil replacement, shock absorber inspection, and steering head bearing adjustment.
- Electrical System: Wiring diagrams, charging system diagnosis, ignition system troubleshooting, and lighting repair.
Maintenance and Repair Procedures
Regular maintenance is vital for the longevity and performance of your BMW Twin. This manual outlines a comprehensive maintenance schedule and provides detailed instructions for various tasks:
- Routine Servicing: Oil and filter changes, spark plug inspection/replacement, valve clearance adjustment, and fluid level checks.
- Component Overhaul: Instructions for disassembling, inspecting, and reassembling major components like the engine, transmission, and final drive.
- Brake System Service: Procedures for inspecting brake pads, discs, calipers, and bleeding the hydraulic system.
- Electrical Diagnostics: Guidance on testing electrical components, tracing faults, and repairing wiring.
- Chassis and Suspension: Maintenance of forks, shocks, swingarm, and steering components.
Always ensure the motorcycle is stable and secure before performing any maintenance or repair work. Disconnect the battery when working on electrical components.
Troubleshooting Common Issues
This section provides a systematic approach to diagnosing and resolving common problems encountered with BMW Twins. It covers symptoms, possible causes, and recommended solutions for issues such as:
- Engine Starting Problems: No crank, slow crank, engine cranks but won't start.
- Poor Engine Performance: Misfires, loss of power, excessive smoke, overheating.
- Braking Issues: Spongy brakes, excessive noise, poor stopping power.
- Electrical Malfunctions: Lights not working, battery not charging, horn failure.
- Unusual Noises: Clunks, rattles, squeals from various parts of the motorcycle.
Refer to the specific system chapters for detailed diagnostic charts and repair procedures.
Manual Specifications
This section provides details about the manual itself. For detailed technical specifications of the BMW Twin motorcycles, please refer to the relevant chapters within the manual.
| Publisher | Haynes Manuals Inc |
| Publication Date | January 1, 1989 |
| Language | English |
| Print Length | 272 pages |
| ISBN-10 | 1850104921 |
| ISBN-13 | 978-1850104926 |
| Item Weight | 1.41 pounds |
Warranty and Support
This document is a workshop manual for BMW Twins motorcycles. Any warranty pertaining to the motorcycle itself should be referred to the original manufacturer, BMW, or the authorized dealer from whom the motorcycle was purchased. This manual does not provide a warranty for the motorcycle.
For inquiries regarding the content or physical quality of this specific workshop manual, please contact the publisher, Haynes Manuals Inc. Contact information for Haynes Manuals Inc. can typically be found on their official website or within the manual's introductory pages.
