The BMW R80 GS and R100 GS models represent a pivotal era in dual-sport motorcycle design, produced around 1990. These iconic machines, powered by robust air-cooled boxer twin-cylinder engines, were engineered for both on-road comfort and formidable off-road capability. Known for their rugged construction and pioneering adventure touring prowess, the GS series established a benchmark for reliability and performance in challenging terrains. Their enduring legacy is marked by innovative engineering, including the Monolever and Paralever suspension systems, which contributed significantly to their reputation and market impact.

This workshop manual provides comprehensive guidance for the service, repair, and maintenance of the BMW R80 GS and R100 GS motorcycles. It covers all essential systems, from the air-cooled boxer engines and 5-speed transmissions to the drivetrain, braking, suspension, and electrical components. Detailed procedures for routine maintenance, complex repairs, and troubleshooting are included, along with essential technical specifications and diagnostic information. This manual is an indispensable resource for owners and technicians seeking to preserve the performance and longevity of these legendary motorcycles.