🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo Glide Year: 1964 Generation Model Generation: Second Generation (FL Series) 👋 Introduction Market Position Historical Significance: The 1964 Duo Glide represents a significant evolution in Harley-Davidson's FL line, featuring the iconic Duo-Glide suspension system, and serving as a bridge between the Panhead and the Shovelhead era. This manual is essential for preserving these classic motorcycles. Competitive Analysis Manual Value Proposition: This factory service manual provides the most accurate and complete information for maintaining and repairing the 1964 Duo Glide, offering a crucial advantage over generic aftermarket guides in accuracy and detail. Key Features Diagnostic Focus: Emphasizes systematic diagnostic procedures, enabling users to pinpoint issues efficiently rather than relying on guesswork. Technical Accuracy: Delivers manufacturer-verified technical data, torque specifications, tolerances, and OEM procedures. 📋 Manual Details Coverage Areas Primary Coverage: Factory Service and Repair Intended Audience: Mechanics and DIY enthusiasts Page Count Estimated Pages: Refer to specific product listing for exact page count. Typical factory service manuals of this era range from 300-600 pages. Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: Print (Paperback or Hardcover) 📖 Manual Coverage Systems Covered Engine: Complete disassembly, assembly, inspection, and repair of the OHV V-twin engine (e.g., Panhead or early Shovelhead engine variants applicable to 1964 models). Transmission: Disassembly, assembly, adjustment, and repair of the 4-speed constant mesh transmission. Clutch: Service and adjustment of the clutch assembly. Primary Drive: Inspection and adjustment of the primary chain drive system. Frame And Suspension: Front fork (hydra-glide/duo-glide) disassembly, repair, and adjustment. Rear suspension servicing. Frame inspection and repair procedures. Brakes: Front and rear brake system inspection, adjustment, and repair (likely drum brakes for this era). Electrical System: Wiring diagrams, ignition system troubleshooting and repair (magneto or battery/coil), lighting system, starter system, generator/alternator (if applicable). Fuel System: Carburetor (e.g., Linkert) disassembly, cleaning, adjustment, and repair. Fuel tank and fuel line servicing. Bodywork And Trim: Fender removal and installation, seat servicing, fuel tank removal and installation, handlebar servicing. Procedures Included Routine Maintenance: Oil changes, lubrication points and schedules, filter replacement, spark plug checks and replacement. Tune Up Procedures: Ignition timing, carburetor adjustment, valve clearance adjustment. Troubleshooting Guides: Systematic diagnostic procedures for common and uncommon issues. Component Rebuilds: Detailed step-by-step instructions for complete engine, transmission, and carburetor rebuilds. Installation And Removal: Procedures for removing and installing major components and sub-assemblies. Adjustment Procedures: Precise instructions for adjusting clutch, brakes, ignition timing, and other critical systems. Technical Depth Depth Of Coverage: Comprehensive. Covers everything from basic maintenance and adjustments to complete engine and transmission rebuilds, including detailed specifications and tolerances. 📊 Manual Specifications File Format Digital Format Notes: If sold as digital, typically PDF. Ensure clarity on searchability and image quality. Print Quality Print Quality: Typically high quality, designed for workshop use. Includes clear diagrams and photographs. Binding Type Binding: Often spiral-bound or sewn/glued binding for lay-flat use in a workshop environment. Paper Type Paper Quality: Durable paper stock designed to withstand workshop conditions. May include coated pages for resistance to oil and grease. ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, OHV (Overhead Valve), V-twin Engine Designation: Typically the Panhead engine (Evo Panhead) or very early Shovelhead designation may appear for 1964 models, check specific VIN range for exact engine. Displacement: Primarily 74 cubic inches (1200cc). Some models may have 80 cubic inches (1310cc) variants. Performance Horsepower Estimate: Approx. 50-55 HP (varies by specific engine configuration and tuning). Torque Estimate: Approx. 65-70 ft-lbs (varies). Fuel System Carburetor: Typically Linkert M-series carburetor (e.g., M74B, M74A). Fuel Type: Unleaded gasoline (higher octane recommended for vintage engines). Ignition System Ignition Type: Battery and coil ignition system or Magneto ignition system depending on specific model variant. Oil System Oil Type: ZDDP-rich motorcycle-specific oil (e.g., SAE 50 or 20W-50 vintage motorcycle oil). Oil Capacity: Approx. 4 quarts (3.8 liters) for engine oil, plus transmission and primary chain case oil. 🔧 Transmission Standard Transmission Type: 4-speed, constant mesh, manual foot shift with heel-and-toe clutch lever. Optional Transmission Options: N/A - Standard 4-speed transmission was the norm for this model. Features Clutch Type: Dry, multi-plate clutch. Transmission Oil Type: Harley-Davidson 4-speed transmission oil or equivalent. 📐 Dimensions Exterior Wheelbase: Refer to specific model documentation for precise wheelbase. Typically around 60-63 inches. Length: Refer to specific model documentation. Typically around 90-95 inches. Weights Dry Weight: Approximately 500-550 lbs (227-250 kg) depending on trim and accessories. Gross Vehicle Weight Rating: Not typically specified in the same manner as cars, but refers to safe operating weight. 🛡️ Safety Features Ratings Safety Ratings: Motorcycles of this era were not subjected to modern crash testing or rating systems. Active Features Braking System: Drum brakes front and rear. Lighting: Headlight, taillight, brake light, turn signals (if equipped). Passive Features Frame Construction: Steel tube frame. Suspension Design: Duo-Glide hydraulic suspension front and rear,...