🏷️ Basic Information Identification Make: Harley-Davidson Model Line: FL/FX Model Designation: Big Twin Model Variant: 1200cc & 1340cc (80 cubic inch) Codes Engine Code Common: Shovelhead Transmission Code: 4-speed Cruise Drive 👋 Introduction Market Position Target User: Harley-Davidson owners and independent repair shops specializing in vintage V-twins. Competitive Analysis Manual Value Proposition: Provides essential information for DIY repairs and maintenance, reducing reliance on expensive dealership services, and preserving the value of classic motorcycles. Key Features Primary Benefit: Empowers owners to perform diagnostics, maintenance, and repairs efficiently and cost-effectively. 📋 Manual Details Coverage Applicable Years: 1978, 1979, 1980, 1981, 1982, 1983, 1984 Specific Models Covered: FL, FX (including variations like Electra Glide, Super Glide, Low Rider, Wide Glide, etc.) Engine Displacements Covered: 74 cubic inch (1200cc), 80 cubic inch (1340cc) Page Count Estimated Pages: Extensive (specific number not provided, but typical for comprehensive service manuals of this era) Manual Type Type: Service and Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine: Full overhaul, top-end, bottom-end, lubrication, cooling (oil), ignition, carburation, fuel delivery. Fuel System: Carburetor (e.g., Keihin butterfly, Bendix) disassembly, cleaning, adjustment, troubleshooting, fuel lines, fuel tank maintenance. Cooling System: Oil cooling system for Shovelhead engines, oil pump, oil filter, oil lines. Electrical System: Wiring diagrams, battery, charging system (alternator/generator), ignition system (points, coil, spark plugs), lighting, starting system, horn, instrumentation. Chassis: Frame, front forks (including Shovelhead FL/FX specific designs), rear suspension, swingarm, wheels, brakes (front and rear disc and drum), steering, controls. Transmission: 4-speed gearbox disassembly, assembly, maintenance, lubrication, clutch operation. Emission Control: Emission control information relevant to the model years, including any exhaust or engine tuning guidelines for emissions compliance. Procedures Included Maintenance: Periodic maintenance schedule, oil changes, filter replacements, chain adjustment, brake adjustments, lubrication points, tune-ups. Repair: Detailed step-by-step repair instructions for all major and minor components, including engine rebuilds, transmission overhauls, suspension repairs, brake system overhauls, and electrical diagnostics. Troubleshooting: Diagnostic charts and procedures for identifying and resolving common problems across all systems. Technical Depth Depth: Comprehensive, covering everything from routine maintenance to complete engine and transmission rebuilds. Includes detailed specifications, tolerances, and torque values. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Fully Printable Accessibility Zoom Functionality: Zoom IN/OUT enabled Delivery Method Delivery: Instant Download Software Requirements Required Software: Adobe PDF Reader, WinZip (or equivalent unzipping software) Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Family: Shovelhead Configuration: Air-cooled, 45-degree V-twin Bore X Stroke 74Ci: 3.4375 in x 4.000 in (87.3 mm x 101.6 mm) Bore X Stroke 80Ci: 3.4375 in x 4.250 in (87.3 mm x 108.0 mm) Performance Horsepower 74Ci Approx: 55-60 HP Torque 74Ci Approx: 75-80 lb-ft Horsepower 80Ci Approx: 60-65 HP Torque 80Ci Approx: 85-90 lb-ft Fuel System Carburetor Types Common: Keihin Butterfly, Bendix/Zenith, sometimes AMF-era Tillotson. Fuel Type: Unleaded gasoline (late models transitioned to unleaded) Lubrication System Type: Dry sump with oil tank separate from crankcase. 🔧 Transmission Standard Type: 4-speed constant mesh, foot shift, left-side clutch lever operation. Features Gear Selection Mechanism: Heel-toe shift lever. Clutch Type: Wet multi-plate, cable operated. Fluid Specifications Transmission Fluid: Typically SAE 50 or 20W-50 motorcycle specific oil. Manual will specify exact type and viscosity. 📐 Dimensions Exterior Wheelbase Approx: 60-64 inches (varies by model: FL tends to be longer) Weights Dry Weight Approx: 550-650 lbs (varies significantly by model and equipment) 🛡️ Safety Features Active Features Brakes: Front: Disc brake (single or dual depending on model/year). Rear: Disc brake or drum brake (depending on model/year). 💡 Technology Features Infotainment Features: Minimal by modern standards. Typically includes analog speedometer, tachometer (optional on some models), oil pressure gauge, and indicator lights. AM radio or basic cassette player might be present on some touring models. Driver Assistance Features: None (basic braking and lighting systems). 🔧 Maintenance Service Intervals Oil Change: Typically every 2,000-3,000 miles or annually, whichever comes first. Manual will detail specific intervals. Primary Chain Tensioner: Regular checks and adjustment are critical, often at every oil change or as per manual. Automatic tensioners became more common later, but early models had manual adjustment or primitive auto tensioners. Spark Plugs: Inspection and gap check every few thousand miles, replacement as needed. Fluid Specifications Engine Oil Capacity: Approximately 3 quarts (2.8 liters) for 74ci, and slightly more for 80ci. Specifics in manual. Engine Oil Type: API SG or higher, SAE 20W-50 motorcycle specific oil (or as specified in the manual for the given climate). Primary Chain Case Oil: Typically Harley-Davidson primary chain oil or SAE 50 gear oil. Capacity around 1 quart. Known Issues Oil Leaks: Common due to aging seals and gaskets; manual provides procedures for replacement. Carburetor Issues: Tuning difficulties, air leaks, float bowl issues with Bendix and Keihin carburetors are frequently discussed in service manuals. Primary Chain Tensioner...