This comprehensive service and repair manual covers Briggs & Stratton engines with serial numbers ranging from 300000001 to 399999999. Featuring over 90 pages of detailed information, this manual provides a complete guide to understanding and repairing your engine, covering everything from routine maintenance like oil changes to more complex repairs such as transmission replacements. With clear instructions and detailed illustrations, this manual will empower you to diagnose and address any issues that may arise, ensuring your engine operates smoothly and efficiently.

The Briggs & Stratton 1840A, produced in 1973, is a classic example of the reliable and durable small engines that made the company a household name. This particular model falls within the serial number range of 300000001-399999999, signifying its production during a specific era. The 100202-0434-01 part number further identifies this engine, likely pertaining to a specific assembly or configuration. Though the specific application of this engine is not explicitly stated, the "Service/Shop Repair Manual" designation suggests it was intended for use in various equipment, potentially lawnmowers, tillers, generators, or other machines common during the 1970s. This manual, a vital resource for mechanics and enthusiasts alike, serves as a comprehensive guide to understanding and repairing the 1840A engine. It likely contains detailed diagrams, component descriptions, troubleshooting steps, and specifications for various aspects of the engine, including its carburetor, ignition system, fuel system, and engine block. The manual is essential for diagnosing and resolving any mechanical issues that may arise, ensuring the engine continues to perform reliably. Owning such a manual is invaluable for anyone seeking to restore, maintain, or simply understand the intricacies of this vintage Briggs & Stratton engine.