This comprehensive service repair manual provides detailed instructions and diagrams for maintaining and repairing your Stihl BR340, 420, SR340, and 420 backpack blowers. It covers a wide range of topics, including engine disassembly and assembly, carburetor adjustments, fuel system troubleshooting, ignition system repair, air filter replacement, and general maintenance procedures. The manual is designed for both professional technicians and DIY enthusiasts, offering clear explanations and step-by-step guidance to help you effectively diagnose and resolve any issues you may encounter with your blower. You'll find detailed exploded views, wiring diagrams, torque specifications, and troubleshooting charts, making this a valuable resource for anyone who wants to keep their Stihl blower in top working condition.

The STIHL BR340, SR340, and BR420 are a series of professional-grade backpack blowers designed for demanding applications like landscaping, forestry, and municipal work. These powerful machines are renowned for their robust construction, impressive performance, and user-friendly design. The BR340 boasts a powerful 42.7cc engine, while the BR420 pushes the limits with its 59.8cc engine, offering an exceptional blowing force for tackling heavy debris and clearing large areas. Both models feature a reliable carburetor equipped with a primer bulb for easy starting, and an easily accessible air filter for convenient maintenance. The SR340, on the other hand, is a lighter and more compact option, designed for smaller jobs like clearing leaves and debris from landscapes and patios. It utilizes a smaller 34.6cc engine, providing a balance of power and portability. All three models share a number of key features that contribute to their efficiency and operator comfort. They feature a comfortable and adjustable harness system, ensuring optimal weight distribution and reducing strain on the user's back. The blowers also feature a multi-function control handle for adjusting the throttle and air volume, allowing for precise control over the blowing force. Furthermore, the STIHL BR340, SR340, and BR420 are all equipped with a robust air intake system that prevents debris from entering the engine, ensuring optimal performance and longevity. With their powerful engines, user-friendly design, and durable construction, these backpack blowers are a reliable choice for professionals seeking efficient and effective debris removal solutions.