This service manual covers the STIHL RE 521, RE 551, RE 551 PLUS, RE 581, RE 581 PLUS, RE 661, RE 661 PLUS, and RE 961 series. These units are powered by robust 2-stroke petrol engines, featuring air-cooled operation and diaphragm carburetors for efficient performance. The direct drive transmission ensures a reliable connection between the engine and pump. Designed for demanding tasks, these STIHL products are engineered for durability and consistent operation, making them a trusted choice for professional use.

This manual provides comprehensive guidance for the maintenance and repair of your STIHL equipment. It details essential procedures, including routine maintenance tasks such as air filter cleaning and fuel filter replacement, as well as specifications for spark plug gaps and fuel mixtures. Technical data, troubleshooting advice, and safety guidelines are also included to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the machinery.

This service manual covers the STIHL RE 521, RE 551, RE 551 PLUS, RE 581, RE 581 PLUS, RE 661, RE 661 PLUS, and RE 961 series. These units are powered by robust 2-stroke petrol engines, featuring air-cooled operation and diaphragm carburetors for efficient performance. The direct drive transmission ensures a reliable connection between the engine and pump. Designed for demanding tasks, these STIHL products are engineered for durability and consistent operation, making them a trusted choice for professional use.

This manual provides comprehensive guidance for the maintenance and repair of your STIHL equipment. It details essential procedures, including routine maintenance tasks such as air filter cleaning and fuel filter replacement, as well as specifications for spark plug gaps and fuel mixtures. Technical data, troubleshooting advice, and safety guidelines are also included to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the machinery.