🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo Glide Year: 1958-1959 Model Variant: 74 OHV (Panhead) Generation Generation: Second Generation Duo-Glide (EFL - Electric Start) 👋 Introduction Market Position Market Position: Essential resource for owners and independent mechanics maintaining classic Harley-Davidson motorcycles. Targets the enthusiast and DIY repair market seeking to preserve and maintain vintage machinery. Target Audience: Harley-Davidson enthusiasts, vintage motorcycle restorers, DIY mechanics, owners of 1958-1959 Duo-Glide models. Competitive Analysis Competitive Analysis: This manual is a direct competitor to other vintage motorcycle repair guides and official Harley-Davidson factory service manuals from the era. Its strength lies in its comprehensive digital format and accessibility for modern users. Key Features Key Features: Instant digital delivery, comprehensive coverage (A-Z), easy-to-follow step-by-step instructions with pictures, cross-platform compatibility (PC, MAC, tablet, phone), printable, cost-saving for DIY repairs. 📋 Manual Details Coverage Coverage Areas: Complete Service and Repair Procedures (A-Z) Page Count Page Count: Not specified, but implied to be comprehensive. Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format Format: Downloadable Digital File (PDF compatible) 📖 Manual Coverage Systems Systems Covered: Engine, Transmission, Drivetrain, Chassis, Electrical System, Fuel System, Brakes, Suspension, Controls, Bodywork, Lubrication, Cooling (air), Ignition System, Starting System (Electric Start), Lighting System, Carburetion, Troubleshooting, Maintenance. Specific Engine Components Covered: Cylinder heads, pistons, connecting rods, crankshaft, camshaft, valve train, oil pump, oil filter (if applicable), engine case assembly, timing cover, primary drive assembly. Specific Transmission Components Covered: Gearbox housing, gears, shafts, shifter mechanism, clutch assembly, primary drive chain, final drive chain. Procedures Procedures Included: Step-by-step repair and service procedures, disassembly and assembly instructions, diagnostic guides, maintenance schedules, torque specifications, wiring diagrams, exploded views, troubleshooting tips, component replacement, adjustments, and tune-ups. Electrical System Procedures: Wiring diagrams, troubleshooting ignition, lighting, charging system (generator/regulator), starter motor, battery maintenance, switches, and indicators. Chassis Procedures: Front fork service and adjustment, rear shock absorber replacement, wheel bearing maintenance, steering head bearing service, frame inspection and repair, brake system overhaul and adjustment. Troubleshooting Methodology: Systematic diagnostic procedures for identifying common and uncommon faults, often presented in a Q&A or symptom-based format. Technical Depth Technical Depth: Comprehensive, covering basic maintenance to complete engine and transmission rebuilds, including advanced diagnostics and adjustments. Engine Rebuild Depth: Complete disassembly, inspection, measurement, and reassembly of the Panhead engine, including potential machining specifications. 📊 Manual Specifications File Format File Format: PDF (or compatible digital format) Searchability: Searchable text (if properly OCR'd PDF). Print Quality Print Quality: High Quality (suitable for printing chapters or full manual) Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Overhead Valve (OHV) V-Twin Engine Displacement: 74 cubic inches (1200cc) Engine Code: E (for electric start models), often referred to as 'Panhead' due to valve covers. Performance Horsepower: Approximately 50-55 HP (estimated, varies with tuning) Torque: Not explicitly stated in product info, but significant for its era. Fuel System Carburetor Type: Linkert M-Series (e.g., M-34 or M-35) or Keihin (later models of this generation). Fuel Type: Gasoline Ignition System Ignition System: Battery and Coil Ignition, Distributor (potentially). Cooling Cooling Method: Air-cooled 🔧 Transmission Standard Transmission Type: 4-Speed Constant Mesh Optional Optional Transmission: N/A (4-speed manual was standard for this generation). Features Clutch Type: Wet multi-plate Drive Type: Primary chain drive to transmission, final chain drive to rear wheel. 📐 Dimensions Exterior Wheelbase: Approximately 59 inches (1498 mm) (typical for the era). Weights Dry Weight: Approximately 550-600 lbs (250-272 kg) (estimated). 🛡️ Safety Features Ratings Safety Ratings: N/A (Vintage motorcycle, safety standards significantly different from modern vehicles). Active Features Active Safety Features: Dual front brake system (standard on Duo-Glide), Drum brakes front and rear, Rider skill and judgment. Passive Features Passive Safety Features: Sturdy frame construction, rider leg protection (engine placement). 💡 Technology Features Infotainment Infotainment System: N/A (This era of motorcycle predates modern infotainment systems. Primary controls are mechanical and electrical.) Driver Assistance Driver Assistance Features: N/A (No electronic driver assistance features present). Connectivity Connectivity Features: N/A (No electronic connectivity features present). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 1,000-2,000 miles (specific interval to be found in manual). Spark Plug Check: Every 1,000-2,000 miles. Chain Adjustment: As needed, typically every few hundred miles or based on slack. Fluid Specifications Engine Oil Type: Viscosity grades such as SAE 50 or 60 (for air-cooled V-twins, specific grade found in manual). Typically mineral-based motorcycle oil. Transmission Oil Type: Specific Harley-Davidson transmission fluid or equivalent GL rated gear oil (specific grade to be found in manual). Primary Chain Case Oil: Motorcycle-specific primary chain case oil or engine oil (specific grade to be found in manual). Brake Fluid Type: N/A (Mechanical drum brakes, no hydraulic fluid in calipers.) Fork Oil Type: Specific fork oil viscosity (e.g., 10W, 20W) as per manual. Known Issues Common Issues: Oil leaks (particularly from...