The STIHL 4-MIX engine represents a significant advancement in power unit technology, designed for demanding applications requiring a blend of power and efficiency. This engine series, known for its robust construction and reliable performance, is engineered to deliver consistent output across various operating conditions. Its innovative design integrates the benefits of a two-stroke and a four-stroke engine, offering enhanced torque and reduced emissions. The versatility of the STIHL 4-MIX engine makes it an ideal choice for a wide range of professional tools and equipment where durability and performance are paramount. This Service Repair Manual provides comprehensive technical information for the STIHL 4-MIX engine. It covers essential maintenance procedures, detailed troubleshooting guides, and critical technical specifications necessary for optimal engine operation and longevity. The manual is intended for owners, technicians, and mechanics seeking to understand, maintain, and repair their STIHL 4-MIX powered equipment. By following the guidelines within this document, users can ensure their equipment remains in peak condition, maximizing its service life and operational effectiveness.