This service manual covers the Stihl MS271 and MS291 models, robust 2-stroke engine-powered tools designed for demanding tasks. Engineered for reliability and performance, these units feature advanced technologies such as electronic ignition and air cooling systems. The MS271 offers a displacement of 50.2 cc and 3.4 hp, while the MS291 boasts a larger 59.0 cc displacement and 4.0 hp, providing ample power for professional use. Both models utilize a fuel mixture of unleaded gasoline with Stihl 2-stroke engine oil at a 50:1 ratio when using Stihl HP Ultra oil, and incorporate features like low-emission exhaust systems and typically an HD2 air filter for efficient operation.

This comprehensive 118-page English service manual provides essential information for the maintenance and repair of the Stihl MS271 and MS291. It details critical procedures for engine management, including carburetor adjustments and ignition system checks, alongside guidance on bar and chain maintenance and general cleaning. The manual also covers specifications for fuel and oil, the automatic chain lubrication system, and typical service intervals for components like the air filter and spark plug. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the longevity and optimal performance of their Stihl equipment.