The Suzuki LT300E / LT-F300 QuadRunner, produced between 1987 and 1989, represents a significant chapter in Suzuki's pioneering ATV history. Known for their ruggedness and utility, these all-terrain vehicles were engineered to provide reliable performance for a variety of off-road applications. Featuring a robust 4-stroke, single-cylinder, air-cooled engine with a displacement of approximately 280 cc, coupled with a 5-speed manual transmission and automatic clutch, the QuadRunner offered a capable and user-friendly experience. Its durable steel frame and effective braking system, typically dual front drum and single rear drum brakes, underscore its focus on practical, dependable operation for enthusiasts and utility users alike. This comprehensive English-language service manual provides essential information for the maintenance and repair of your Suzuki LT300E / LT-F300 QuadRunner. Covering a wide array of systems, including detailed engine mechanicals, fuel and lubrication systems, transmission, drivetrain, steering, suspension, electrical components, and braking systems, this guide is designed for both owners and professional technicians. It details routine maintenance procedures, troubleshooting diagnostics, and in-depth repair instructions for common issues such as carburetor cleaning and drive chain wear, ensuring the longevity and optimal performance of your ATV.