🏷️ Basic Information Identification Make: Harley-Davidson Model: FXS Year: 1981 Codes Engine Family: Shovelhead Model Code: FXSB 👋 Introduction Market Position Target Audience: Do-it-yourself owners and experienced mechanics Competitive Analysis Value Proposition: Inexpensive way to keep your vehicle working properly, saving on professional service costs Key Features Ease Of Use: Numbered instructions, bold figure numbers, easy-to-use table of contents, detailed illustrations Critical Information: Notes, cautions, and warnings throughout each chapter pinpoint critical information 📋 Manual Details Coverage Areas General Coverage: Complete official full factory service repair manual covering all styles Page Count Estimated Pages: Hundreds of pages Manual Type Type: Workshop Service Repair Manual Language Language: English Format Digital Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine disassembly and repair Transmission: Complete transmission overhaul and repair Primary Drive: Primary drive system service and repair Clutch: Clutch service, adjustment, and replacement Fuel System: Fuel system diagnosis, cleaning, and adjustment Exhaust Systems: Exhaust system inspection and service Electrical System: Comprehensive electrical system diagnosis and repair, including wiring diagrams Front Suspension: Front suspension service and repair Rear Suspension: Rear suspension service and repair Steering: Steering system maintenance and repair Brakes: Brake system inspection, service, and repair Kickstarter: Kickstarter system service and repair Procedures Included Maintenance: Periodic lubrication, general maintenance, tune-up procedures Troubleshooting: Step-by-step troubleshooting guides for common and complex issues Repair: Detailed step-by-step repair procedures for all covered systems Technical Depth Depth: Complete disassembly and reassembly guidance with hundreds of photos and illustrations Diagnostic Assistance: Troubleshooting and electrical service procedures combined with detailed wiring diagrams 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Printable in its entirety or just needed pages, without restriction Binding Type Delivery Method: Instant Download Paper Type Media Type: Digital (can be burned to CD-ROM) Requirements Software Requirement: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: Shovelhead V-Twin Performance Engine Displacement: Typically 80 cubic inches (1340cc) for Shovelhead models Fuel System Carburetor: Likely a Keihin Butterfly or a Linkert carburetor, depending on specific sub-model and factory configuration. Fuel Delivery: Gravity feed from fuel tank to carburetor Ignition System Ignition Type: Contact breaker point ignition with magneto or battery-coil system 🔧 Transmission Standard Transmission Type: 4-speed constant mesh Features Clutch Type: Wet multi-plate clutch Primary Drive: Chain drive (enclosed in primary cover) 📐 Dimensions Exterior Wheelbase: Varies by specific FXS variant, but typically around 63-64 inches Weights Dry Weight: Approximately 500-550 lbs, depending on exact configuration. 🛡️ Safety Features Ratings Safety Standards: As per applicable regulations for motorcycles of that era; no formal crash test ratings like cars. Active Features Braking System: Hydraulic disc brakes front and rear (typical for FX models of this era) 💡 Technology Features Infotainment Audio System: Not applicable for this era and model, focus is on mechanical and electrical systems. Driver Assistance Safety Aids: None; emphasis on rider control and mechanical components. Connectivity Connection Options: None; purely mechanical and electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 2,000-3,000 miles or as specified in the manual. Primary Chain Tension: Requires periodic adjustment, usually specified at oil changes or as needed. Fluid Specifications Engine Oil Type: Specific Harley-Davidson approved V-twin motorcycle oil (e.g., SAE 20W50) Transmission Oil Type: Harley-Davidson transmission lubricant or equivalent Primary Oil Type: Harley-Davidson primary chaincase lubricant or equivalent Known Issues Shovelhead Common Concerns: Oil leaks (especially from pushrod tubes and primary cover), valve guide wear, potential for oil blow-by. Electrical System Concerns: Older wiring can become brittle; rectifier and regulator issues are common on vintage bikes. Tune Up Components Spark Plugs: Specific Harley-Davidson recommended spark plug part number Ignition Timing: Critical for optimal performance; requires specific timing marks and procedure. 📚 Vehicle History Brand Heritage Brand Legacy: Harley-Davidson is an iconic American motorcycle manufacturer with a rich history dating back to 1903. Model Evolution Shovelhead Era: The Shovelhead engine, introduced in 1966, replaced the Panhead and was produced until 1984, known for its distinctive sound and robust performance. Production Fxs Model Context: The FXS designation typically referred to the Low Rider model, a popular cruiser in Harley-Davidson's lineup, known for its extended front forks and lower seat height. 🏆 Awards & Recognition Recognitions Historical Significance: The Shovelhead engine is considered a classic and iconic powerplant in Harley-Davidson's history, sought after by enthusiasts.