🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Year: 1958-1959 👋 Introduction Market Position Target Audience: Professional technicians, experienced DIY enthusiasts, and owners seeking in-depth maintenance knowledge. Competitive Analysis Value Proposition: Offers comprehensive repair and maintenance information, enabling significant cost savings on professional labor. Key Features Manufacturer Authenticity: Written by manufacturers, providing original and accurate data. Convenience: Instant download eliminates shipping costs and delays, allowing immediate access. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Repair Manual Language: English Format: PDF Delivery Method: Instant Download 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly procedures. Fuel System: Carburetor adjustment, fuel pump servicing, fuel tank maintenance. Ignition System: Spark plug servicing, ignition timing, coil and condenser testing. Transmission: Gearbox inspection, maintenance, and repair procedures. Clutch: Clutch adjustment, plate inspection, and replacement. Electrical System: Wiring diagrams, lighting system troubleshooting, battery maintenance, charging system. Brakes: Drum brake adjustment and maintenance, hydraulic component inspection. Suspension: Front fork servicing, rear shock absorber maintenance, lubrication. Frame And Bodywork: Frame inspection, fender and tank mounting, seat servicing. Wheels And Tires: Tire pressure checks, spoke tension, bearing lubrication. Procedures Included Routine Maintenance: Periodic maintenance charts and recommended service intervals. Troubleshooting: Diagnostic guides for common problems and their solutions. Step By Step Repair: Detailed, illustrated instructions for various repair tasks. Overhaul Procedures: In-depth instructions for complete component overhauls. Technical Depth Depth Of Information: Suitable for professional technicians and advanced DIY mechanics. 📊 Manual Specifications File Format File Type: PDF Printability: Full Printable Searchability: Likely searchable text within PDF, enhancing user experience. Zoom Functionality: Yes Binding Type Binding: Digital (N/A for download, but implies printable pages) Paper Type Paper Type: Digital (N/A for download, but implies standard paper for printing) Requirements Software Requirements: Adobe PDF Reader, WinRAR Compatibility: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled OHV V-twin Displacement 1958: 74 cu in (1208 cc) Displacement 1959: 74 cu in (1208 cc) Bore X Stroke 1958: 3.4375 in x 4.125 in (87.3 mm x 104.8 mm) Bore X Stroke 1959: 3.4375 in x 4.125 in (87.3 mm x 104.8 mm) Compression Ratio Approx: 7.0:1 (varies with model variant) Performance Horsepower Approx: 40-45 hp (at 4800 rpm, varies by specific model/tuning) Torque Approx: Not officially documented, estimated to be around 55-60 lb-ft Fuel System Carburetor Type: Linkert M74B Fuel Type: Premium Unleaded Gasoline (minimum 91 octane recommended) 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, foot shift with hand clutch Optional Optional Transmission: N/A for these model years Features Clutch Operation: Handlebar-mounted clutch lever Shift Operation: Foot-operated gear shifter Transmission Fluid Type: Harley-Davidson Primary Chaincase Lubricant or equivalent SAE 50 📐 Dimensions Exterior Wheelbase: Approx. 60.5 inches (1537 mm) Length: Approx. 90 inches (2286 mm) Weights Dry Weight: Approx. 500-550 lbs (227-250 kg), varies by model variant (e.g., FL vs. FLH) Gross Vehicle Weight Rating: Not explicitly stated, but designed for rider and passenger plus luggage. 🛡️ Safety Features Ratings Crash Test Ratings: N/A (Vehicles of this era were not subjected to standardized crash testing as per modern automotive standards.) Active Features Braking System: Dual drum brakes (front and rear). Passive Features Lighting: Headlight, taillight, brake light, turn signals (depending on market and specific model variant). 💡 Technology Features Infotainment Infotainment System: N/A (Vehicles of this era did not feature electronic infotainment systems.) 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-1,500 miles (1600-2400 km) or as specified in the manual. Primary Chain Adjustment: Check and adjust as needed, often every few thousand miles. Carburetor Cleaning: As required, depending on fuel quality and usage. Fluid Specifications Engine Oil Type: Harley-Davidson Genuine V-Twin Motor Oil SAE 50 or equivalent API SF/CD rated oil. Engine Oil Capacity: Approx. 3 quarts (2.8 liters) Primary Chaincase Oil Type: Harley-Davidson Primary Chaincase Lubricant or equivalent SAE 50. Primary Chaincase Oil Capacity: Approx. 1 quart (0.95 liters) Transmission Oil Type: Harley-Davidson Transmission Lubricant SAE 75W-90 or equivalent GL-4 rated gear oil. Transmission Oil Capacity: Approx. 0.75 pints (0.35 liters) Fork Oil Type: Specific fork oil weight as per manual, typically 10W or 15W. Known Issues Panhead Engine Leaks: Common for older Panhead engines to exhibit minor oil seepage from various seals and gaskets. Carburetor Tuning: Linkert carburetors can be finicky and require regular adjustment for optimal performance. Electrical System Aging: Original wiring harnesses and components may be aged and require inspection or replacement. 📚 Vehicle History Brand Heritage Brand Legacy: Harley-Davidson is a legendary American motorcycle manufacturer with a rich history dating back to 1903. Model Evolution Duo Glide Introduction: The Duo-Glide designation signified the introduction of hydraulic front and rear suspension, a significant advancement for Harley-Davidson. Predecessor: Evolved from earlier Panhead models, notably the Hydra-Glide. Production Production Period: 1958-1959 Manufacturing Location: Milwaukee, Wisconsin, USA 🏆 Awards & Recognition Recognitions Historical Significance: The Duo-Glide...