🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo-Glide Engine Configuration: OHV V-Twin Engine Displacement Code: 74 Part Number: 99482-59 👋 Introduction Market Position Target Audience: Owners and mechanics specializing in vintage Harley-Davidson motorcycles, particularly the Panhead and Shovelhead era (though primarily Panhead for the '59 model). Competitive Analysis Value Proposition: Provides essential, manufacturer-specific technical data for maintaining and repairing a highly sought-after classic motorcycle, bridging the gap for owners who need reliable information. Key Features Illustration Detail: Emphasis on detailed, fully illustrated content ensures visual guidance for complex procedures. Model Specificity: Highly specific to the 74 OHV Duo-Glide, ensuring accuracy for the intended models. 📋 Manual Details Coverage Applicable Models Primary: 1959 Harley-Davidson Duo-Glide 74 OHV Applicable Models Secondary: 1958 Harley-Davidson Duo-Glide 74 OHV (with minor differences) Applicable Models General: Earlier 1961-1974 OHV Harley-Davidson Models Page Count Total Pages: 140 Manual Type Type: Workshop Manual / Repair Manual / Service Manual Language Language: English Format Format: Downloadable 📖 Manual Coverage Systems Covered Engine: Comprehensive coverage of the 74 OHV V-Twin engine, including disassembly, assembly, tuning, and troubleshooting. Chassis: Detailed information on frame, suspension (front fork and rear shocks), steering, and wheels. Transmission: In-depth coverage of the gearbox, clutch, and final drive components. Electrical: Extensive details on the ignition system, lighting, charging system (generator/regulator), and wiring diagrams. Miscellaneous: Coverage of braking systems, fuel system (carburetor, fuel tank, lines), exhaust system, and bodywork/trim. Procedures Included Maintenance: Routine maintenance tasks, lubrication, adjustments, and fluid changes. Repair: Step-by-step repair instructions for various components and systems. Troubleshooting: Diagnostic guides and common issue resolutions for engine, electrical, and mechanical problems. Rebuilds: Complete disassembly and reassembly procedures for major components like the engine and transmission. Technical Depth Depth: Comprehensive, from basic adjustments to full engine and transmission overhauls, suitable for both amateur mechanics and professional technicians. Illustrations: Fully illustrated with detailed diagrams and exploded views for clarity. 📊 Manual Specifications File Format Digital Format: Likely a PDF or similar digital document, optimized for download. Print Quality Clarity: Implied high quality due to 'fully illustrated' detail, suitable for printing or digital viewing. Binding Type Binding: N/A (Downloadable Format) Paper Type Paper: N/A (Downloadable Format) Coverage Areas Covered Sections Overview: Product (general overview), Chassis, Engine, Transmission, Electrical, Miscellaneous. ⚙️ Engine Specifications Primary Engine Engine Type: Overhead Valve (OHV) V-Twin Engine Displacement: 74 cubic inches (approximately 1213 cc). This typically refers to the Panhead engine of this era (EL, FL, FLH series). Bore Stroke Estimate: Likely 3.4375 inches bore x 4.25 inches stroke for the 74 cubic inch Panhead. Performance Horsepower Estimate: Approximately 50-55 HP (varies by tune and specific model variant FL vs FLH). Torque Estimate: Estimated around 70-80 ft-lbs, with peak torque typically available at lower RPMs. Fuel System Carburetor Type: Typically a Linkert M74B or M74G carburetor, or early Keihin offerings. Fuel Type: Leaded gasoline (prior to unleaded transition), typically 86-89 octane rating. Ignition System Ignition Type: Contact breaker points ignition with a coil and distributor (or magneto on some earlier or specialized models). Cooling System Cooling Method: Air-cooled 🔧 Transmission Standard Transmission Type: 4-speed constant mesh manual transmission. Optional Optional Transmissions: N/A for this specific model year and engine configuration; 4-speed was standard. Features Clutch Type: Dry multi-plate clutch. Gear Ratios: Specific gear ratios will be detailed within the manual for each of the 4 speeds. Transmission Fluid: Typically SAE 50 or SAE 60 straight-weight gear oil. 📐 Dimensions Exterior Wheelbase Estimate: Approximately 59-61 inches, depending on specific model variant. Weights Dry Weight Estimate: Around 550-600 lbs, depending on equipment and accessories. Gross Vehicle Weight Rating Estimate: N/A specific GVWR, but designed for rider and passenger load. 🛡️ Safety Features Ratings Safety Standards: No formal modern safety ratings (e.g., NHTSA, Euro NCAP) apply to this era of motorcycle. Safety features are mechanical. Active Features Brakes: Drum brakes front and rear. Specifications for brake shoe lining, drum tolerances, and adjustment procedures will be in the manual. Suspension: Telescopic front fork (likely hydraulic damped) and rear swingarm with dual shock absorbers. Manual will detail maintenance and rebuilds. Passive Features Lighting: Headlight, taillight, brake light, turn signals (depending on market and optional equipment). Manual covers bulb types and wiring. 💡 Technology Features Infotainment Infotainment Systems: N/A. This era of motorcycle predates modern infotainment systems. Features are mechanical and electrical. Driver Assistance Assistance Features: N/A. No electronic driver assistance features. Connectivity Connectivity Features: N/A. Primarily mechanical and basic electrical systems. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000-2,000 miles, or at least annually. Manual will specify exact intervals and procedures. Tune Up Interval: Recommended every 2,000-3,000 miles, including ignition timing, carburetor adjustment, and valve lash checks. Fluid Specifications Engine Oil Type: Commonly recommended: Harley-Davidson genuine oil, Shell Rotella T 30 or 40 (non-synthetic) or similar heavy-duty straight-weight oils. Manual will confirm specific API service classification. Primary Chain Case...