🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Year: 1958 Generation Generation: FL Series (Pre-Shovelhead) 👋 Introduction Market Position Target Audience: Professional motorcycle technicians, experienced DIY mechanics, and restorers Competitive Analysis Value Proposition: Provides comprehensive, factory-level repair and maintenance information for the iconic 1958 Duo-Glide, eliminating the need for costly dealership services or incomplete aftermarket guides. Key Features Detail Level: Extremely detailed, with numbered steps, cautions, warnings, and exploded views Usability: User-friendly with a numbered table of contents and bold figure numbers for quick referencing Accessibility: Instant digital download format for immediate access and no shipping costs 📋 Manual Details Coverage Areas Engine Service: Complete overhaul, tuning, and component repair Transmission Service: Disassembly, assembly, adjustment, and component repair Electrical System: Wiring diagrams, troubleshooting, lighting, ignition, charging system Chassis And Suspension: Frame, forks, shocks, steering, wheel bearings Braking System: Front and rear brake mechanisms, adjustments, and maintenance Bodywork And Trim: Fenders, tanks, seat, controls, and accessories Page Count Estimated Pages: Approximately 300-400 (based on typical comprehensive service manuals of this era) Manual Type Type: Full Service and Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine Mechanical: Cylinder head, cylinders, pistons, connecting rods, crankshaft, camshaft, valve train, oil pump, timing gears Fuel System: Carburetor (likely Linkert), fuel lines, fuel tank, fuel filter Ignition System: Distributor, coils, spark plugs, points, condenser Charging System: Generator, voltage regulator, battery Clutch And Drivetrain: Clutch assembly, primary drive, final drive chain Suspension Front: Telescopic fork service, fluid changes, seal replacement Suspension Rear: Shock absorber service, bushings, pivot points Wheels And Tires: Wheel bearings, spoke tension, tire pressure, tire replacement Procedures Included Routine Maintenance: Oil changes, lubrication points, filter replacement, spark plug checks, chain adjustment Engine Rebuilding: Complete engine tear-down, component inspection, clearance measurements, reassembly Carburetor Overhaul: Disassembly, cleaning, jetting, adjustment, and troubleshooting Ignition Timing: Setting ignition timing with points and distributor Electrical Troubleshooting: Diagnostic procedures for common electrical faults using wiring diagrams Suspension Overhaul: Fork seal replacement, shock absorber rebuilds, steering head bearing adjustment Brake Adjustment: Cable adjustments, brake shoe inspection and replacement Technical Depth Diagnostic Capabilities: Comprehensive troubleshooting guides for engine, electrical, and mechanical issues Repair Scope: Covers everything from basic adjustments to full engine and transmission rebuilds Illustrations: Detailed drawings, diagrams, and photographs for step-by-step guidance Professional Level: Prepared for professional technicians, offering the same depth as factory manuals 📊 Manual Specifications File Format Digital Format: PDF Print Quality Printable: Full Printable (all pages) Binding Type Digital Binding: N/A (Digital Download) Paper Type Digital Paper Type: N/A (Digital Download) Delivery Method Delivery: Instant Download Software Requirements Reader Requirement: Adobe PDF Reader Extraction Requirement: WinRAR (for compressed files if applicable) Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 45-degree V-twin OHV Displacement: 74 cubic inches (1208 cc) Bore X Stroke: 3.4375 in x 4.125 in (87.3 mm x 104.8 mm) Compression Ratio: Approximately 7.0:1 (varies with specific model and tuning) Performance Horsepower: Estimated 40-45 HP @ 4800 RPM (typical for the era) Torque: Estimated 60-65 lb-ft @ 3000 RPM (typical for the era) Fuel System Carburetor Type: Linkert M74B (or similar variant) Fuel Octane Rating: Regular leaded gasoline (e.g., 91-94 RON / 87-89 AKI) Lubrication System Oil Capacity: Approximately 4 U.S. quarts (3.8 liters) of engine oil Oil Type: Viscosity SAE 50 or SAE 20W-50 (depending on ambient temperature) - typically petroleum-based 🔧 Transmission Standard Type: 4-speed constant mesh, foot-shifted Optional Features: Hand clutch lever (left side handlebar) Features Transmission Fluid: Harley-Davidson transmission lubricant or equivalent (e.g., petroleum-based gear oil) 📐 Dimensions Exterior Wheelbase: Approximately 60.5 inches (1537 mm) Length: Approximately 90 inches (2286 mm) Weights Dry Weight: Approximately 550-600 lbs (250-272 kg) 🛡️ Safety Features Ratings Safety Features: Basic motorcycle safety features of the era; no modern electronic safety systems Active Features Braking System: Drum brakes (front and rear) 💡 Technology Features Infotainment Features: N/A (No infotainment systems or electronic features typical of modern motorcycles) 🔧 Maintenance Service Intervals Engine Oil Change: Every 1,000 - 1,500 miles (1600 - 2400 km) or annually, whichever comes first. Primary Chain Lubrication: Regularly checked and topped up, typically with the same oil as the engine. Ignition Points Cleaning And Gap: Every 1,000 - 2,000 miles (1600 - 3200 km) or as needed based on performance. Carburetor Cleaning And Adjustment: As needed, or every 2,000 - 3,000 miles (3200 - 4800 km). Fluid Specifications Engine Oil Viscosity: SAE 50 or SAE 20W-50 (depending on ambient temperature). Transmission Oil Type: Harley-Davidson transmission lubricant or equivalent (e.g., petroleum-based gear oil). Fork Oil: Specific fork oil as per manual recommendations (likely a light to medium weight oil). Known Issues Common Wear Items: Valve guides, piston rings, clutch plates, ignition points, generator brushes, and fork seals. Carburetor Issues: Linkert carburetors can be prone to wear and require...