The ROTAX FR125 is a high-performance kart engine designed for competitive racing. This 2-stroke, single-cylinder engine features a bore of 54 mm and a stroke of 54.5 mm, resulting in a displacement of 124.8 cc. It delivers approximately 14-16 horsepower and utilizes a centrifugal clutch for direct drive operation. The engine is air-cooled and equipped with a digital ignition system and a Dell'Orto PHBG 21 carburetor. Its robust construction and precise engineering ensure reliability and consistent performance on the track, making it a favored choice for racing enthusiasts.

This Repair Workshop Manual provides comprehensive guidance for the maintenance and repair of the ROTAX FR125 engine. It covers essential procedures, technical specifications, and troubleshooting steps necessary to keep the engine in optimal condition. Detailed information on service intervals, including recommended piston ring and cylinder rebuild times, is included. The manual is written in English and is designed to assist owners, mechanics, and technicians in performing all necessary upkeep and repairs accurately and efficiently.