This Service Repair Workshop Manual provides comprehensive guidance for JLO engines. It covers a wide range of single-cylinder engine models, including the L-99, L-230, L-227, L-295, R-295, L-297, L-300, and L-340 series, as well as twin-cylinder models such as the LR-340/2, LR-399/2, LR-440/2, and LS-600/2. The manual is designed to offer detailed technical information, ensuring owners and technicians can effectively maintain and repair these engines. The scope of this manual is extensive, encompassing engine fundamentals, operating instructions, and complete disassembly and assembly procedures. It delves into specific systems like carburetors, spark plugs, ignition, and exhaust systems, and includes coverage of recoil starters and engine timing. Furthermore, it provides wiring diagrams, diagnostic troubleshooting, dimensional data, and information on service and gasket sets. With hundreds of illustrations and photos, this English-language manual is an invaluable resource for both do-it-yourselfers and experienced mechanics seeking to understand and maintain their JLO engines.