🏷️ Basic Information Identification Make: Harley-Davidson Model: FL / FLH Duo-Glide Model Variant: 74 OHV Panhead Generation Years Covered: 1958-1964 👋 Introduction Market Position Positioning: Essential resource for owners and mechanics of iconic Harley-Davidson Duo-Glide models. Competitive Analysis Benefit Statement: Provides immediate access to critical repair and maintenance information, enabling efficient problem-solving and vehicle upkeep. Key Features Delivery Method: Instant Download, No Shipping Fees Content Quality: Easy to read text, top quality diagrams, and step-by-step instructions. 📋 Manual Details Coverage Areas Primary Focus: Service and Repair Page Count Estimated Page Count: Varies by original publication; typically extensive for full service manuals. Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Digital PDF Download 📖 Manual Coverage Systems Covered Engine: Complete disassembly, assembly, tuning, troubleshooting, and repair of the Panhead OHV engine. Transmission: Service and repair procedures for the 4-speed constant mesh transmission. Drivetrain: Primary drive, clutch, and final drive (chain drive) maintenance and repair. Suspension: Front fork (telescopic), rear suspension (swingarm with hydraulic shocks), and related components. Brakes: Front and rear brake systems (drum brakes), including adjustments and relining. Electrical System: Ignition system (magneto/generator/battery), lighting, charging system, and wiring diagrams. Fuel System: Carburetor service and adjustment (e.g., Linkert), fuel tanks, and fuel lines. Frame And Body: Frame inspection, repair, fenders, tanks, and seat mounting. Procedures Included Maintenance: Scheduled maintenance, lubrication, adjustments, and routine checks. Troubleshooting: Diagnostic guides for common problems across all major systems. Repair: Step-by-step instructions for component disassembly, repair, and reassembly. Rebuilds: Detailed procedures for complete engine and transmission rebuilds. Part Replacement: Instructions for replacing individual components and wear items. Technical Depth Depth: Comprehensive, covering everything from basic adjustments to full engine and transmission overhauls. Suitable for both novice and experienced mechanics. 📊 Manual Specifications File Format Format: PDF Print Quality Quality: Full Printable Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Zoom Functionality Zoom: Yes (Zoom IN/OUT) Software Requirements Requirements: Adobe PDF Reader & WinZip (for extraction) Compatibility Operating Systems: Compatible with All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: OHV (Overhead Valve) V-Twin "Panhead" Displacement: 74 cubic inches (1200cc) Performance Horsepower Approx: Approximately 50-60 HP (varies by specific year and tuning) Torque Approx: Torque figures typically not prominently featured in period manuals but would be significant for the era. Fuel System Carburetor: Typically Harley-Davidson Linkert (e.g., M74B) or early Keihin. Ignition System Ignition Type: Battery ignition or Magneto ignition (depending on specific year and model variant). Cooling System Cooling: Air Cooled 🔧 Transmission Standard Transmission Type: 4-speed Constant Mesh Optional Optional Transmissions: N/A for this generation, 4-speed was standard for Duo-Glide. Features Clutch Type: Wet, multi-plate 📐 Dimensions Exterior Wheelbase Approx: Approximately 61.5 inches (1562 mm) Seat Height Approx: Approximately 29-31 inches (737-787 mm) Weights Dry Weight Approx: Around 550-600 lbs (250-270 kg) 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycles of this era were not subject to standardized crash testing as modern cars are). Active Features Active Safety: Mechanical drum brakes front and rear. Passive Features Passive Safety: Sturdy frame construction. 💡 Technology Features Infotainment Infotainment Systems: N/A (These are classic motorcycles with no modern infotainment systems). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-2,000 miles or seasonally, depending on usage and oil type. Tune Up Interval: Regular ignition timing adjustments, carburetor tuning, and general inspections recommended at frequent intervals (e.g., every 2,000-3,000 miles). Fluid Specifications Engine Oil Type: Typically SAE 50 or SAE 60 motorcycle-specific oil (e.g., Harley-Davidson's own oil, mineral-based oils recommended for the era). Transmission Oil Type: Harley-Davidson transmission oil or equivalent gear oil (e.g., SAE 80W-90). Primary Chain Case Oil: Harley-Davidson primary chain lubricant or equivalent. Fork Oil Type: Specific fork oil weight as per manual, often a light to medium weight oil. Known Issues Common Problems: Oil leaks (especially from the Panhead rocker boxes and base gaskets), clutch adjustment, electrical system maintenance (generator output, points), carburetor tuning, and carburetor float bowl leaks. Parts Availability: While many original parts are scarce, a robust aftermarket exists for many wear items and common replacement parts. 📚 Vehicle History Brand Heritage Brand Legacy: Harley-Davidson, a storied American motorcycle manufacturer with a history dating back to 1903. Model Evolution Model Lineage: The FL and FLH Duo-Glide models represent a significant evolution from earlier Hydra-Glide models, introducing the hydraulic rear suspension system, hence 'Duo-Glide'. Panhead Era: The Panhead engine, produced from 1948 to 1965, is renowned for its distinctive rocker box covers resembling a frying pan. Production Manufacturing Location: Milwaukee, Wisconsin, USA 🏆 Awards & Recognition Recognitions Collectibility: Highly collectible motorcycles, considered icons of American motorcycling. Ratings Reputation: Revered for their robust build, distinctive styling, and the soulful rumble of the Panhead engine.