The KTM 540 SXS Engine, produced between 2000 and 2007, represents a robust single-cylinder, 4-stroke, liquid-cooled powerhouse with a displacement of 540 cc. Engineered for performance, this engine features a bore of 95 mm and a stroke of 76.4 mm, coupled with a 11.5:1 compression ratio. It utilizes a Keihin PWK 39 carburetor for fueling and a CDI ignition system, with forced lubrication managed by an oil pump. The transmission is a 5-speed manual system employing a wet multi-disc clutch, designed for reliability and efficient power delivery. This Service Repair Manual provides comprehensive guidance for the KTM 540 SXS Engine models from 2000 to 2007. It covers essential areas including general information, engine removal and refitting, detailed disassembly and assembly procedures, servicing of individual components, electrical systems, fuel system maintenance, and troubleshooting. The manual also includes a periodic maintenance schedule, wiring diagrams, and technical specifications such as oil capacity, spark plug type, and valve clearances. This resource is designed to assist owners, mechanics, and technicians in maintaining and repairing the engine effectively.