🏷️ Basic Information Identification Make: Harley-Davidson Model: FXB Year: 1981 Engine Type: Shovelhead Vin Code: 1HD1PA... 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and experienced mechanics. Value Proposition: An inexpensive way to keep your vehicle working properly by providing comprehensive repair and service information. Key Features Completeness: Complete official full factory service repair manual covering all styles of the 1981 FXB. Accessibility: Instant download, no shipping costs or waiting time. User Experience: Designed for ease of use with detailed instructions, illustrations, and a structured table of contents. 📋 Manual Details Coverage Areas General Information: True Troubleshooting: True Periodic Lubrication: True Maintenance: True Tune Up: True Engine: True Clutch: True Primary Drive: True Transmission: True Kickstarter: True Fuel System: True Exhaust Systems: True Electrical System: True Front Suspension: True Steering: True Rear Suspension: True Brakes: True Index: True Wiring Diagrams: True Page Count Estimated Pages: Hundreds of Pages Manual Type Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Complete disassembly, overhaul, and reassembly of Shovelhead engine components, including cylinders, pistons, connecting rods, crankshaft, camshafts, and valve train. Fuel System: Carburetor (likely Keihin Butterfly or Super E/G) adjustments, rebuilding, and troubleshooting; fuel tank, lines, and petcock service. Ignition System: Points and condenser ignition system troubleshooting, timing adjustments, coil and spark plug service. Electrical System: Wiring diagrams, battery maintenance, charging system (alternator/generator), lighting, starter system, and accessory wiring. Drivetrain: Primary drive (clutch, chain, compensator), transmission (gearbox operation, lubrication, internal components), and final drive (belt or chain, depending on FXB variant). Suspension: Front fork service (oil changes, seal replacement, adjustment), steering head bearing maintenance and adjustment, rear shock absorber inspection and replacement. Braking System: Front and rear brake caliper service, master cylinder overhaul, brake line replacement, brake fluid flushing, and adjustment. Chassis And Frame: Frame inspection, identification of components, and basic adjustments. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain lubrication and adjustment, tire pressure checks, brake adjustments, and general inspection points. Troubleshooting Diagnostics: Step-by-step guides for diagnosing common running issues, electrical faults, and mechanical problems. Engine Rebuilds: Detailed procedures for complete engine teardown, inspection, measurement, part replacement, and reassembly, including piston ring installation, bearing clearances, and gasket replacements. Transmission Overhaul: Disassembly and reassembly of the transmission, including gear inspection, shaft replacement, and shifter mechanism adjustments. Electrical Diagnostics: Testing of electrical components, circuit tracing using wiring diagrams, and common electrical fault identification. Suspension Fork Service: Front fork fluid changes, seal replacement, and fork component disassembly. Brake System Service: Brake pad replacement, caliper rebuilding, master cylinder service, and bleeding procedures. Technical Depth Detail Level: Comprehensive, from basic maintenance to complete engine and transmission overhauls. Illustrations: Hundreds of photos and illustrations to guide repair procedures. Instructions Format: Numbered, step-by-step instructions with detailed substeps, notes, cautions, and warnings. Diagnostics Focus: Dedicated sections for troubleshooting, especially for the electrical system, combined with wiring diagrams. 📊 Manual Specifications File Format Compatibility: Compatible with all PC-based Windows operating systems and Mac. Storage Options: Can be saved to hard drive and burned to CD-ROM. Print Quality Printability: Printable without any restriction, either in part or in its entirety. Binding Type Delivery Format: Digital Download Paper Type Software Requirements: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Designation: Shovelhead Engine Layout: Air-cooled, V-twin Displacement: 80 cubic inches (1340cc) Bore X Stroke: 3.50 in x 4.25 in (88.9 mm x 107.95 mm) - Typical for 80ci Shovelhead Performance Horsepower Estimate: Approximately 55-65 HP (estimated, actual may vary based on tuning and model specifics) Torque Estimate: Approximately 65-75 lb-ft (estimated, actual may vary based on tuning and model specifics) Fuel System Carburetor Type: Typically Keihin Butterfly or aftermarket options like S&S Super E/G Fuel Type: Unleaded gasoline Lubrication Oil Type: Viscosity recommended by Harley-Davidson for the era, likely 20W-50 or 20W-40 motorcycle-specific oil. Oil Capacity: Approximately 3 quarts (2.8 liters), including filter. 🔧 Transmission Standard Transmission Type: 4-speed constant mesh Features Clutch Type: Wet, multi-plate Transmission Fluid: Hypoid gear oil or Harley-Davidson specified transmission fluid. 📐 Dimensions Exterior Wheelbase: Approximately 63.5 inches (1613 mm) - Varies slightly by specific FXB configuration. Weights Dry Weight: Approximately 575 lbs (261 kg) - Varies slightly by specific FXB configuration. 💡 Technology Features Infotainment Features: Basic, primarily focused on analogue instrumentation (speedometer, tachometer, oil pressure gauge, ammeter). Driver Assistance Features: None typical for this era; focus is on mechanical operation. 🔧 Maintenance Service Intervals Engine Oil Change: Every 2,000-3,000 miles or annually, whichever comes first. Primary Chain Adjustment: Every 5,000 miles. Clutch Adjustment: As needed, typically during 5,000-mile service. Spark Plug Replacement: Every 5,000-10,000 miles, depending on plug type. Transmission Fluid Change: Every 10,000 miles or annually. Fluid Specifications Engine Oil Viscosity: 20W-50 Motorcycle Specific Transmission Fluid Type: Hypoid Gear Oil (e.g., SAE 90 or specified Harley-Davidson equivalent) Known Issues Oil Leaks: Common on...