🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Model Variant: 74 OHV Production Years: 1958-1959 👋 Introduction Market Position Target Audience: Harley-Davidson owners, mechanics, technicians, and enthusiasts seeking detailed repair and maintenance information for 1958-1959 Duo-Glide models. Key Features Visual Aids: Contains hundreds of pages with detailed photos and diagrams for clear instruction. Instruction Style: Step-by-step instructions designed for professional mechanics and technicians. Authenticity: Represents factory service information, providing authentic procedures. Accessibility: Instant download compatible with computers, tablets, and smartphones. 📋 Manual Details Coverage Areas Manual Type: Service Repair Workshop Manual Language: English Format: Downloadable PDF Page Count Estimated Page Count: Hundreds of Pages (Specific count not provided, but described as extensive) 📖 Manual Coverage Systems Covered Engine: Comprehensive coverage of the 74 OHV engine, including disassembly, assembly, tuning, and troubleshooting. Transmission: Detailed procedures for the motorcycle's transmission system, including gear shifting mechanisms and internal components. Electrical System: In-depth coverage of the electrical system, including wiring diagrams, ignition system, lighting, charging system, and battery maintenance. Fuel System: Detailed instructions for the carburetor(s), fuel tank, fuel lines, and associated components. Brakes: Service and repair procedures for the braking system, including linkage, pads/shoes, and hydraulic/mechanical components. Suspension: Information on front and rear suspension systems, including forks, shock absorbers, and related adjustments. Chassis And Frame: Procedures related to the motorcycle's frame, including inspections, repairs, and mounting of components. Bodywork And Trim: Guidance on the removal, installation, and maintenance of body panels, fenders, and decorative elements. Procedures Included Routine Maintenance: Step-by-step instructions for oil changes, filter replacements, lubrication, spark plug service, and general tune-ups. Troubleshooting: Diagnostic procedures and common problem identification for various systems. Repair And Rebuild: Detailed guides for disassembly, inspection, repair, and reassembly of major motorcycle components. Adjustment And Calibration: Instructions for adjusting engine timing, carburetor settings, clutch, brakes, and suspension. Ignition System Service: Detailed instructions for distributor, points, condenser, and ignition coil service and adjustment. Lubrication Points: Identification and maintenance of all lubrication points throughout the motorcycle. Tire And Wheel Service: Procedures for tire mounting/dismounting, wheel balancing (if applicable), and spoke tensioning. Frame And Suspension Alignment: Guidelines for checking and adjusting frame and suspension alignment for safe handling. Technical Depth Diagnostic Capabilities: Advanced diagnostic information for identifying and resolving complex mechanical and electrical issues. Rebuild Procedures: Complete overhaul procedures for engine, transmission, and other major assemblies. Special Tools: Identification and usage of specialized tools required for specific repair tasks. Torque Specifications: Essential torque values for critical fasteners throughout the engine, transmission, and chassis. Clearances And Tolerances: Precise specifications for engine component clearances (e.g., valve lash, piston-to-wall) and bearing tolerances. Exploded Diagrams: Highly detailed exploded views of all major assemblies, aiding in part identification and assembly order. Wiring Diagrams: Complete and detailed wiring schematics for easy diagnosis and repair of electrical issues. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable PDF for easy content navigation. Print Quality Print Capability: Printable pages (single or entire manual). Binding Type Binding: N/A (Digital download) Paper Type Paper Type: N/A (Digital download) Licensing Usage Rights: Unlimited use on multiple devices, no expiry, no renewal fees. ⚙️ Engine Specifications Primary Engine Engine Type: OHV (Overhead Valve) V-twin Displacement: 74 cubic inches (approx. 1200cc) Cylinder Arrangement: 90-degree V-twin Cooling System: Air-cooled Performance Bore X Stroke: Typically around 3.4375 in. x 4.00 in. (Exact specifications likely detailed in manual) Compression Ratio: Varies by specific sub-model and tune, generally in the range of 7.0:1 to 8.0:1 Fuel System Carburetion: Single Linkert carburetor (e.g., M74B or similar models, specific type detailed in manual) Fuel Type: Gasoline 🔧 Transmission Standard Transmission Type: 4-speed constant mesh Clutch Type: Dry multi-plate clutch Features Gear Selection: Foot shift lever with heel-toe operation. Drive Type: Primary drive via chain to transmission; final drive via chain to rear wheel. 📐 Dimensions Weights Dry Weight: Approx. 565 lbs (256 kg) for the Duo-Glide models (specific weight may vary by configuration) 💡 Technology Features Infotainment Infotainment Features: This era of motorcycles predates modern infotainment systems. Features would be limited to basic instrumentation (speedometer, ammeter, oil pressure gauge). Driver Assistance Driver Assistance Features: No electronic driver assistance features typical of modern vehicles. Connectivity Connectivity Features: No electronic connectivity features. 🔧 Maintenance Service Intervals Oil Change Interval: Typically recommended every 1,000 to 2,000 miles, or annually, depending on usage (specifics in manual). Spark Plug Service: Regular inspection and cleaning/replacement as per manual recommendations (often every few thousand miles). Fluid Specifications Engine Oil: Viscosity and type (e.g., SAE 50 or 20W-50 motorcycle-specific oil) will be detailed in the manual. Often a mineral-based oil was used. Transmission Oil: Specific gear oil viscosity and type (e.g., SAE 90 or similar) will be specified in the manual. Primary Chaincase Oil: Type and capacity for the primary drive lubrication will be provided. Known Issues Carburetor Tuning: Linkert carburetors can require precise adjustment for...