This manual covers Stihl FS120, FS200, FS300, FS350, FS400, FS450, FR350, and FR450 models. These units are equipped with robust 2-stroke gasoline engines, featuring electronic ignition and air cooling for reliable operation. Their design incorporates a direct drive system through a bevel gearbox and is controlled by a trigger throttle with electronic feedback. The versatility of these machines is enhanced by their compatibility with various cutting attachments, making them suitable for a wide range of demanding tasks. This comprehensive service and repair manual provides essential information for the maintenance and upkeep of your Stihl equipment. It details procedures for fuel mixture, gearbox oil changes, and spark plug replacement, along with air filter maintenance. Technical specifications, including engine displacement, power output, and weight variations across models, are also included. This guide is an indispensable resource for owners and technicians seeking to ensure the longevity and optimal performance of their Stihl machinery.