The JLO LR-399 (2F-400-1) Engine Factory Service Repair Manual provides a comprehensive guide to maintaining and repairing your engine. This official manual, created by the factory, goes beyond basic instructions and offers in-depth knowledge typically possessed by factory-trained technicians. It is designed to empower any owner to confidently make informed decisions about their engine's maintenance and repair needs.

The manual covers a wide range of topics, including engine fundamentals, operating instructions, carburetors, spark plugs, ignition systems, exhaust systems, disassembly and assembly procedures, engine and recoil components, timing instructions, wiring diagrams, and troubleshooting guides. It also features detailed service item and gasket set information, dimensional data, and warranty details, ensuring you have all the information you need at your fingertips.

The manual is packed with clear illustrations, diagrams, and specifications that guide you through every repair procedure step by step. Detailed instructions, notes, cautions, and warnings are strategically placed throughout each chapter to highlight crucial information and ensure safe and effective repairs. Enlarged insets allow for a closer examination of parts, while a numbered table of contents simplifies navigation and helps you quickly find the information you need. You can easily print any page or diagram, making it convenient to reference the manual while working on your engine.

The JLO LR-399 (2F-400-1) is a renowned two-stroke engine, known for its power, reliability, and widespread use in various applications. Originally designed and manufactured by the JLO Motoren Werke GmbH, a German engine manufacturer, the LR-399 gained recognition as a robust and versatile power plant. It's known for its compact size and lightweight design, making it suitable for installation in a variety of equipment, including motorcycles, go-karts, mopeds, and even small watercraft. The engine features a single-cylinder, air-cooled configuration, with a displacement of 49.9 cc and a bore and stroke of 40mm x 39mm. Driven by a 2-stroke fuel-air mixture, the LR-399 achieves a respectable output, making it a reliable choice for powering various recreational and industrial applications.

The LR-399's popularity extends beyond its performance. The engine's simple construction and readily available parts make maintenance and repairs relatively straightforward. This makes it an attractive option for owners seeking a reliable and easily maintainable power source. The JLO LR-399 remains a popular choice for enthusiasts and professionals alike, with a strong aftermarket support network ensuring continued availability of parts and accessories. While the original JLO Motoren Werke GmbH is no longer in operation, the legacy of the LR-399 engine lives on, with dedicated enthusiasts and repair shops continuing to preserve and maintain these iconic power plants. The engine's durability and ease of maintenance have contributed to its enduring popularity, making it a reliable and sought-after choice for various applications.