This Service Repair Workshop Manual covers Stihl FS90, FS100, FS110, and FS130 models equipped with the Basismotor 4180. These machines are powered by a 2-stroke petrol engine, designed for demanding tasks and built to Stihl's renowned standards of engineering quality and reliability. The manual provides comprehensive information for these versatile power units, ensuring their optimal performance and longevity. This English-language manual offers detailed guidance for all repairs, servicing, and troubleshooting procedures. It includes hundreds of pages of professional content, featuring detailed photos, diagrams, and exploded views to aid understanding. Owners, mechanics, and technicians will find essential information on maintenance intervals, fluid specifications, required tools, and crucial safety guidelines, enabling effective upkeep and repair of the Stihl FS series equipment.