🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Year: 1958-1959 Codes Engine Family: Panhead Generation Model Generation: Third Generation Duo-Glide 👋 Introduction Market Position Target Audience: Professional Technicians, Enthusiasts, DIY Mechanics Value Proposition: Comprehensive resource for repair, maintenance, and restoration of 1958-1959 Harley-Davidson Duo-Glide models. Competitive Analysis Manual Quality: Equivalent to official factory service manuals used by professionals. Key Features Navigation: Numbered table of contents for quick information retrieval. Safety Information: Notes, cautions, and warnings integrated throughout procedures. 📋 Manual Details Coverage Areas Coverage Years: 1958, 1959 Vehicle Types: Motorcycle Manual Type Manual Type: Full Service Repair Manual Language Language: English Format File Format: PDF Delivery Method: Instant Download Page Count Page Count: Not Specified (Comprehensive) 📖 Manual Coverage Systems Covered Engine: Complete Engine Overhaul, Carburetion, Ignition System, Lubrication System Transmission: Gearbox Assembly, Clutch, Primary Drive Chassis: Frame, Suspension (Front and Rear), Steering Electrical: Wiring Diagrams, Lighting System, Charging System, Battery, Ignition Components Brakes: Drum Brake Systems (Front and Rear) Bodywork: Fuel Tank, Fenders, Seat Assembly, Handlebars Procedures Included Maintenance: Regular Service, Oil Changes, Filter Replacements, Tune-ups Repair: Component Rebuilds, Troubleshooting, Part Replacements, Diagnostic Procedures Restoration: Detailed guidance for refurbishing and restoring original components Technical Depth Depth Of Coverage: Comprehensive (Suitable for Professional Technicians and Advanced DIYers) Diagnostic Procedures: In-depth troubleshooting for mechanical and electrical issues Illustrations: Detailed illustrations, drawings, and photos Wiring Diagrams: Included, combined with electrical service procedures 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Full Printable Searchability: Likely searchable text within PDF (standard for professional manuals) Binding Type Binding: Digital (Downloadable) Paper Type Paper Type: N/A (Digital Format) Requirements Software Requirements: Adobe PDF Reader, WinRAR Operating System Compatibility: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled OHV V-twin Engine Displacement 1958: 73.7 cubic inches (1208cc) Engine Displacement 1959: 73.7 cubic inches (1208cc) Engine Code Designation: Panhead (FLH for high compression, FL for standard compression) Performance Horsepower Estimated: Approximately 50-55 hp (depending on FL/FLH variant) Torque Estimated: Not readily available for this era, but substantial low-end torque characteristic of Panheads. Fuel System Carburetor Type: Linkert M-Series (e.g., M38, M74) or S&S Super E (aftermarket) Fuel Type: Leaded gasoline (preferred for period-correct engines), or unleaded with appropriate octane rating. Ignition System Ignition Type: Battery and Coil, Magneto ignition was phased out. 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, foot-shifted, hand-clutched. Clutch Type: Wet multi-plate, operated by handlebar lever. Features Primary Drive: Chain drive from engine crankshaft to transmission input shaft, enclosed in a primary case. Final Drive: Belt drive from transmission output sprocket to rear wheel sprocket. 📐 Dimensions Exterior Wheelbase: Approximately 61 inches (1550 mm) Weights Dry Weight: Approximately 545-570 lbs (247-259 kg), depending on configuration. Gross Vehicle Weight Rating: Not officially specified for motorcycles in this era, but designed to carry rider and passenger. 🛡️ Safety Features Ratings Crash Test Ratings: Not applicable for motorcycles from this period. Active Features Braking System: Mechanical drum brakes front and rear. Passive Features Lighting: Headlight, taillight, brake light, turn signals (depending on regional specification). 💡 Technology Features Infotainment Infotainment System: N/A (This era predates modern infotainment systems; primary focus is mechanical and electrical functionality). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000 - 2,000 miles or annually, depending on usage and oil type. Engine Tune Up: Recommended annually or every 2,000-3,000 miles for ignition and carburetion adjustments. Belt Tension Check: Regular checks and adjustment of final drive belt tension are critical. Fluid Specifications Engine Oil Type: High-quality motorcycle-specific V-twin oil (e.g., 20W50 or 50W, depending on temperature and preference, historically HD 360). Transmission Oil Type: Motorcycle-specific gear oil or specialized transmission fluid. Primary Chain Case Oil Type: Harley-Davidson primary chain oil or equivalent. Fork Oil Type: Specific weight fork oil, as detailed in the manual. Known Issues Leaks: Common to find oil leaks from engine seals, gaskets, and pushrod tubes due to age and material degradation. Carburetion Issues: Linkert carburetors can be finicky and require frequent adjustment or rebuilding. Electrical System: Aging wiring, points ignition system, and generators/alternators can require attention. Drum Brakes: Drum brakes offer less stopping power than modern disc brakes and require frequent adjustment and lining checks. 📚 Vehicle History Brand Heritage Brand Founding: 1903 Brand Philosophy: American-made, classic V-twin cruiser motorcycles. Model Evolution Predecessor: Hydra-Glide Development: Introduction of hydraulically operated telescopic front forks and rear suspension (hence 'Duo-Glide'). Production Production Period: 1958-1964 (Duo-Glide) Manufacturing Location: Milwaukee, Wisconsin, USA 🏆 Awards & Recognition Recognitions Historical Significance: Iconic model in Harley-Davidson's history, representing a significant step in rider comfort and control. Ratings Collector Value: Highly sought after by collectors and enthusiasts for its classic styling and historical importance.