This workshop service and repair manual covers Harley-Davidson FL and FX Big Twin motorcycles from the production years 1978 through 1984. These models are powered by the iconic Shovelhead engine, available in 74 cubic inch (1200cc) and 80 cubic inch (1340cc) displacements, paired with a 4-speed constant mesh transmission. Renowned for their distinctive V-twin rumble and classic cruiser styling, the FL models typically represent touring variants, while the FX models encompass custom and Super Glide configurations. These motorcycles are celebrated for their robust engineering, American heritage, and the raw riding experience they provide, making them a staple among enthusiasts and collectors.

This comprehensive manual is designed to provide detailed technical information for the maintenance, troubleshooting, and repair of your Harley-Davidson FL/FX Big Twin. It covers all major systems, including the Shovelhead engine, 4-speed transmission, fuel system, ignition, electrical components, brakes, suspension, frame, and wheels. Inside, you will find step-by-step procedures for routine maintenance, complete disassembly and assembly instructions, diagnostic guides for common issues, and essential technical specifications, torque values, and fluid recommendations. This resource is invaluable for owners, mechanics, and technicians seeking to preserve the performance and longevity of these classic motorcycles.