🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Year: 1958-1959 Codes Engine Code: Panhead (OHV) 👋 Introduction Market Position Target Audience: Harley-Davidson enthusiasts, owners, mechanics, and restorers of 1958-1959 Duo-Glide models. Key Features Manual Utility: Essential guide for maintenance, repair, and restoration, providing factory-level technical information. Content Comparison: Comparable in scope and detail to original factory service and owner's manuals. 📋 Manual Details Coverage Areas Covered Models: Harley-Davidson Duo-Glide 1958, Harley-Davidson Duo-Glide 1959 Page Count Estimated Page Count: Refer to specific manual for exact count; typically extensive for factory-level repair. Manual Type Manual Type: Repair Service Manual / Workshop Manual Manual Scope: Factory Service Manual equivalent, covering repair and maintenance. Language Language: English Format File Format: PDF Delivery Method: Instant Download 📖 Manual Coverage Systems Covered Engine: Complete overhaul, tuning, troubleshooting, carburetor, ignition, lubrication systems. Transmission: 4-speed constant mesh; disassembly, assembly, maintenance, troubleshooting. Frame And Suspension: Front fork (leading link), rear suspension (swingarm, shocks), frame inspection and repair. Brakes: Drum brake systems (front and rear), hydraulic components, adjustments, and service. Electrical System: Wiring diagrams, lighting, ignition system (points, condenser), battery, charging system (generator). Fuel System: Fuel tank, fuel lines, fuel filters, carburetor (e.g., Linkert M-series). Body And Fittings: Fenders, fuel tank, seat, saddlebags, chrome components, fairings (if equipped). Charging System: Generator, voltage regulator (mechanical), battery maintenance. Procedures Included Maintenance: Scheduled maintenance checks, lubrication points, fluid changes, filter replacements. Repair: Step-by-step repair procedures for all major components and systems. Disassembly: Detailed instructions for component removal and teardown. Assembly: Reassembly instructions with torque specifications and proper component orientation. Troubleshooting: Diagnostic guides for common problems and their solutions. Illustrations Diagrams: Detailed illustrations, exploded views, and wiring diagrams are typically included. Specifications: Critical torque values, clearances, timing specifications, and other essential data. Technical Depth Depth Level: Comprehensive; suitable for professional technicians and advanced DIY mechanics with basic electrical and mechanical knowledge. 📊 Manual Specifications File Format Print Quality: Full Printable Viewability: Zoom IN/OUT capability Software Requirements: Adobe PDF Reader, WinZip Operating System Compatibility: All Versions of Windows & Mac Binding Type Digital Binding: N/A (Digital PDF) Paper Type Digital Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 45-degree V-twin, overhead valve (OHV) - 'Panhead' generation Displacement: 74 cubic inches (1212 cc) - EL/FL models Bore X Stroke: 3.4375 in x 4.25 in (87.3 mm x 108.0 mm) Compression Ratio: Approximately 7.0:1 (varies slightly by model/year) Cylinder Head Design: Cast iron heads with integrated valve guides and seats. Performance Horsepower: Approx. 55-60 HP @ 4800 RPM (estimated, varies by tuning) Torque: Approx. 75-80 ft-lbs @ 3500 RPM (estimated) Peak Rpm: Redline typically around 5000-5500 RPM, with optimal operating range below 4800 RPM. Fuel System Carburetor Type: Linkert M-series (e.g., M74B, M74C, M76) Fuel Type: Premium Unleaded Gasoline (typically 87 octane or higher, check original specs for leaded/unleaded compatibility). 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, foot-shifted, hand-clutched Features Clutch Type: Dry, multi-plate, operated by hand lever Primary Drive: Chain drive, enclosed in oil bath primary case Final Drive: Belt drive 📐 Dimensions Exterior Wheelbase: Approximately 60.5 inches (1537 mm) Weights Dry Weight: Approximately 500-550 lbs (227-250 kg), varies by equipment Gross Vehicle Weight Rating: Approximately 800-900 lbs (363-408 kg) 🛡️ Safety Features Ratings Crash Safety: N/A (Motorcycle; safety primarily relies on rider skill and proper maintenance) Active Features Braking System: Drum brakes, front and rear Passive Features Lighting: Headlight, taillight, brake light, turn signals (may be optional or dealer-installed) 💡 Technology Features Infotainment Audio System: N/A (Pre-infotainment era motorcycle) Driver Assistance Rider Aids: N/A (Mechanical systems only) 🔧 Maintenance Service Intervals Engine Oil Change: Every 2,000-3,000 miles or annually (refer to manual for specific recommendation). Primary Chain Case Service: Check and adjust primary chain tension regularly; fluid change annually or as per manual. Tune Up Intervals: Points and condenser, spark plugs, carburetor tuning typically every 5,000-10,000 miles or as needed based on performance. Fluid Specifications Engine Oil Type: Typically SAE 50 or 60 (mineral oil) for the Panhead engine, with specific Harley-Davidson recommendations. Avoid modern synthetic oils not rated for flat-tappet engines. Primary Chain Case Oil: Harley-Davidson Primary Chain Lubricant or equivalent (typically a specific weight gear oil or transmission fluid). Transmission Oil: Typically SAE 50 or 60 (mineral oil), compatible with the gearbox. Brake Fluid Type: DOT 3 or DOT 4 brake fluid (check manual for specific recommendation, as older systems may have different requirements). Fork Oil Type: Specific type and viscosity recommended in the manual, often a dedicated fork oil or SAE 10W. Known Issues Oil Leaks: Common with vintage motorcycles; requires careful attention to gaskets, seals, and case integrity. Carburetor Tuning: Linkert carburetors can be finicky and require regular adjustment for optimal performance. Ignition Points: Points and condenser require periodic cleaning, adjustment, and eventual replacement. Rear Suspension Leaks: Hydraulic seals in the rear shocks can degrade...