🏷️ Basic Information Identification Make: Harley-Davidson Model: FL Duo-Glide Model Variant: FLH Duo-Glide Years Covered: 1958-1964 Engine Type: OHV Panhead Engine Displacement Cc: 74 cubic inches (1208 cc) 👋 Introduction Market Position Market Segment: Classic American V-twin cruiser motorcycles Target Audience: Harley-Davidson owners, mechanics, restorers, and enthusiasts of classic American motorcycles. Competitive Analysis Competitive Era Rivals: Chiefly domestic competition from other Harley-Davidson models and potentially other large-displacement American motorcycles of the era. European competition was generally in smaller displacement categories. Key Features Historical Significance: Represents a significant period in Harley-Davidson's evolution, showcasing the robust Panhead engine and the introduction of the Duo-Glide suspension system, a precursor to modern touring comfort. Manual Value Proposition: Provides essential technical data and repair procedures, enabling owners and mechanics to maintain and restore these iconic motorcycles, preserving their value and functionality. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Troubleshooting Page Count Estimated Pages: Likely extensive, typical for professional shop manuals of the era (exact count not provided in product info but expected to be comprehensive) Manual Type Type: Professional Service and Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine Systems: Engine disassembly, assembly, tuning, lubrication, cooling, ignition, fuel systems (carburetion), exhaust systems Drivetrain Systems: Transmission (4-speed), clutch, primary drive, final drive, drive chain maintenance Chassis Systems: Frame, front suspension (hydra-glide fork), rear suspension (dual shocks), wheels, tires, brakes (drum brakes front and rear) Electrical Systems: Wiring diagrams, lighting, charging system (generator), ignition system, battery, controls Bodywork And Fittings: Fuel tank, fenders, seat, handlebars, controls, accessories, body panel removal/installation Procedures Included Maintenance Procedures: Routine servicing, oil changes, filter replacements, lubrication points, chain adjustment, brake adjustments, tune-ups Repair Procedures: Engine overhaul, transmission repair, fork seal replacement, brake relining, electrical component repair, carburetor rebuilding Troubleshooting: Diagnostic charts, common problem identification and solutions for all major systems Assembly Procedures: Detailed step-by-step instructions for engine assembly, transmission rebuild, and overall motorcycle reassembly. Special Tool Identification: Likely includes information on specialized tools required for certain repair procedures, as is typical for professional manuals. Technical Depth Depth Of Information: Comprehensive, step-by-step instructions with detailed exploded diagrams and illustrations, suitable for both novice and experienced mechanics. Wiring Diagrams: Includes comprehensive electrical wiring diagrams essential for troubleshooting and repairs. Manual Completeness Completeness Statement: The manual is stated to be the 'most complete' and covers 'every single detail' of the machine, reflecting its status as a professional shop manual. 📊 Manual Specifications File Format File Type: PDF Searchability: PDF format generally allows for text searching, enhancing usability. Print Quality Printability: Full Printable Zoom Capability: Yes (Zoom IN/OUT) Binding Type Binding: Not Applicable (Digital PDF) Paper Type Paper Type: Not Applicable (Digital PDF) Delivery Method Delivery: Instant Download Requirements Software Requirements: Adobe PDF Reader, WinZip (or similar unzipping software) Compatibility: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Configuration: 45-degree V-twin, air-cooled Cylinder Head Design: Overhead Valve (OHV) 'Panhead' design Bore X Stroke: Typically 3.4375 inches x 4.00 inches (87.3 mm x 101.6 mm) Performance Horsepower Estimated: Approximately 50-55 hp (specific figures vary by year and tuning) Torque Estimated: Strong low-end torque characteristic of Harley-Davidson V-twins Fuel System Carburetor Type: Typically Linkert or early Keihin butterfly carburetors Fuel Type: Gasoline Ignition System Ignition Type: Contact breaker points ignition, generator charging system 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, foot-shifted (with heel-toe shifter) Optional Clutch Type: Dry multi-plate clutch, hand-operated Features Primary Drive: Chain drive within a primary case Gear Ratios: Specific gear ratios are detailed within the manual, crucial for understanding performance characteristics. 📐 Dimensions Exterior Wheelbase Inches: Approximately 59.5 - 60 inches (varies slightly) Tire Sizes: Specified in the manual, typically common sizes for the era like 3.00-18 front and 4.00-18 rear, but exact specifications should be verified. Weights Dry Weight Lbs: Approximately 550-570 lbs (varies by model and equipment) 🛡️ Safety Features Ratings Safety Features Era: Basic safety features for the era; focus on mechanical integrity and rider control. No modern electronic aids. Active Features Braking System: Drum brakes, front and rear. Mechanical actuation. Passive Features Lighting: Headlight, taillight, stoplight, turn signals (depending on market/spec). 💡 Technology Features Infotainment Infotainment Systems: None. These motorcycles are analog machines with basic instrumentation (speedometer, ammeter). Driver Assistance Driver Assistance Features: None. Connectivity Connectivity Features: None. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1000-1500 miles (consult specific manual for exact recommendations) Major Service: Periodic comprehensive checks, including valve adjustments, ignition timing, and carburetor tuning, typically annually or at higher mileage intervals. Fluid Specifications Engine Oil Type: Conventional V-twin motorcycle oil, often a straight-weight (e.g., SAE 50 or 60) or multigrade (e.g., 20W-50), depending on climate and manufacturer recommendation. Zinc content is beneficial. Transmission Oil Type: Specific gear oil or heavy-duty motorcycle transmission fluid (check manual for GL rating and viscosity). Primary...