🏷️ Basic Information Identification Make: Harley-Davidson Model: Knucklehead Engine Type: V-Twin OHV Generation Generation Name: EL/FL Series Codes Engine Codes: E, F, U (variations within years) 👋 Introduction Market Position Target Audience: Mechanics and DIY individuals working on Harley-Davidson Knucklehead motorcycles from 1940-1947. Competitive Analysis Value Proposition: Comprehensive, detailed, and instantly accessible repair information for a historically significant motorcycle model, enabling owners and technicians to maintain and restore these iconic machines effectively. Key Features Instant Download: Immediate access to the manual after purchase, eliminating shipping delays and costs. Printable: Allows users to print specific sections or the entire manual for ease of use during repairs. Completeness: Guaranteed complete and intact manual with no missing pages or sections. 📋 Manual Details Coverage Areas Covered Years: 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947 Page Count Number Of Pages: 166 Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Detailed diagnosis, removal, disassembly, assembly, inspection, adjustment, and installation of all engine components (e.g., cylinders, pistons, crankshaft, camshaft, valves, lubrication system, ignition system). Transmission: Service and repair procedures for the transmission, including gear inspection, shifting mechanisms, and clutch operation. Fuel System: Carburetor (e.g., Linkert) disassembly, cleaning, adjustment, and troubleshooting; fuel tank and line servicing. Electrical System: Wiring diagrams, ignition system (magneto/distributor), lighting, horn, and charging system servicing. Chassis And Suspension: Fork disassembly and service, rear suspension components, frame inspection and repair, steering head bearing service. Brakes: Front and rear brake system maintenance, adjustment, and repair (drum brakes for this era). Bodywork: Fenders, fuel tank, seat, handlebars, and control lever servicing. Procedures Included Maintenance: Scheduled maintenance, lubrication, fluid changes, filter replacements, tune-ups, and general upkeep. Troubleshooting: Diagnostic charts and procedures for identifying and resolving common operational issues. Repair And Rebuild: Comprehensive step-by-step instructions for component overhaul and complete vehicle repair. Adjustment: Detailed procedures for adjusting engine timing, carburetor settings, brakes, clutch, and other critical components. Installation And Removal: Guidance on safely removing and reinstalling major assemblies and components. Technical Depth Depth: In-depth, comprehensive coverage suitable for professional mechanics and experienced DIY enthusiasts, covering everything from basic adjustments to full engine rebuilds. Visual Aids: Detailed illustrations, exploded diagrams, drawings, and photographs for all service procedures. Special Tools: Identification and usage instructions for special service tools required for specific repair operations. 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Fully printable pages Searchability: Implied searchability within PDF document. Binding Type Binding: Digital Download (PDF) Paper Type Paper Type: N/A (Digital) Compatibility Operating Systems: Windows, Mac, Linux OS Software Requirement: Adobe Reader ⚙️ Engine Specifications Primary Engine Engine Displacement: 61 cubic inches (1000cc) for EL models, 74 cubic inches (1200cc) for FL models. Engine Design: Air-cooled, 45-degree V-twin, overhead valve (OHV) design. Performance Horsepower: Typically in the range of 25-35 HP, depending on specific model and year. Torque: Torque figures vary by specific engine variant (e.g., E vs. F). Fuel System Carburetor Type: Primarily Harley-Davidson Linkert carburetors (e.g., M-series). Ignition System: Battery and coil ignition or magneto ignition, depending on year and model. 🔧 Transmission Standard Type: 4-speed constant mesh manual transmission. Optional Options: N/A for this period; manual transmission was standard. Features Clutch: Wet multi-plate clutch. 📐 Dimensions Exterior Wheelbase: Varies slightly by model, typically around 56-57 inches. Weights Dry Weight: Approximately 450-550 lbs, depending on model (EL vs. FL). 🛡️ Safety Features Ratings Safety Standards: Designed to pre-WWII safety standards; modern safety features are not applicable. Active Features Braking System: Drum brakes front and rear. Manual emphasizes proper adjustment and maintenance for effective braking. Passive Features Frame Construction: Robust steel frame designed for durability. 💡 Technology Features Infotainment Infotainment System: N/A. This era predates modern infotainment systems. Driver Assistance Driver Assistance Features: N/A. No electronic driver assistance features present. Connectivity Connectivity Options: N/A. No digital connectivity features. 🔧 Maintenance Service Intervals Engine Oil Change: Specific intervals (e.g., every 1,000-2,000 miles) are detailed in the manual, along with recommended oil types. Tune Up Intervals: Regular tune-ups including spark plug inspection, ignition timing, and carburetor adjustments are essential and covered. Fluid Specifications Engine Oil: The manual will specify appropriate viscosity grades (e.g., SAE 50 or SAE 20W-50 depending on ambient temperature and formulation) and types of oil (mineral-based). Transmission Oil: Specific gear oil types and viscosities for the transmission will be listed. Primary Chain Case Oil: Specifications for the primary drive lubricant will be provided. Known Issues Valve Adjustment: Frequent valve lash checks and adjustments are critical for engine longevity and performance, a key focus in the manual. Carburetor Tuning: Linkert carburetors require precise adjustments; the manual details the correct procedures to avoid running issues. Primary Chain Tension: Maintaining correct primary chain tension is crucial and covered in the manual. Oil Leaks: Common for vintage motorcycles; the manual will provide guidance on identifying and sealing...