The 1990 Suzuki LT80L Quad Runner is a versatile all-terrain vehicle (ATV) designed for recreational riding and entry into off-road activities. As a popular youth model, it embodies Suzuki's heritage of producing reliable and performance-oriented vehicles. This 79 cc, 2-stroke, air-cooled ATV features an automatic continuously variable transmission (CVT) with a single-speed forward and reverse gear system, and is driven by a chain to the rear axle. Its robust engineering ensures durability for its intended use, making it a trusted choice for young riders and enthusiasts. This factory service manual provides comprehensive workshop repair and maintenance guidance for the Suzuki LT80L Quad Runner. It covers all major systems, including detailed procedures for engine disassembly, assembly, and tuning, as well as fuel, ignition, cooling, transmission, drivetrain, suspension, braking, electrical, steering, and body/frame systems. The manual includes routine maintenance, troubleshooting diagnostics, and overhaul instructions, offering factory-level accuracy with specific torque specifications and clearances. It serves as an essential resource for owners, independent repair shops, and mechanics to ensure the proper upkeep and repair of this classic ATV.