The STIHL FS 25-4 is a robust and reliable tool designed for demanding tasks. Featuring a powerful 2-stroke gasoline engine with a displacement of 25.4 cc and an output of 0.7 kW (0.95 hp), it is engineered for efficiency and performance. This model incorporates an integrated anti-vibration system for enhanced user comfort during prolonged operation and is equipped with a direct drive transmission and a spiral bevel gearbox. Its versatile design, including a bike handle for optimal control, makes it suitable for a wide range of cutting applications when paired with various compatible cutting heads.

This service manual provides comprehensive guidance for the maintenance and repair of the STIHL FS 25-4. It covers essential information such as engine specifications, fuel mixture recommendations, and operational features. Detailed procedures for maintenance tasks, including air filter cleaning and spark plug replacement, are outlined to ensure the longevity and optimal performance of the unit. Technical specifications, including weight and fuel tank capacity, are also included, offering valuable data for owners, mechanics, and technicians.