This comprehensive Harley Davidson Knucklehead Workshop Service Repair Manual covers models manufactured from 1940 to 1947. It provides detailed instructions and guidance for maintenance, repair, and troubleshooting of your classic motorcycle. This manual is your go-to resource for everything from basic adjustments to complex engine rebuilds. The manual is filled with detailed illustrations, exploded diagrams, and step-by-step procedures that guide you through every aspect of servicing your Knucklehead. It includes information on: * **Engine:** Disassembly, assembly, and repair procedures for the iconic Knucklehead engine, including valve adjustments, timing, and troubleshooting common engine problems. * **Transmission and Clutch:** Detailed explanations on the operation, adjustment, and repair of your Knucklehead's transmission and clutch system. * **Electrical System:** Guidance on troubleshooting and repairing the electrical system, including wiring diagrams, component identification, and repair procedures. * **Chassis and Suspension:** Step-by-step instructions for inspecting, adjusting, and repairing the chassis, suspension, brakes, and steering components. * **Bodywork and Accessories:** Detailed instructions for removing, installing, and repairing bodywork, fenders, and various accessories. This manual also includes valuable technical data such as tightening torques, service specifications, and troubleshooting charts. It is an essential resource for both professional mechanics and DIY enthusiasts who want to ensure their Knucklehead remains in top condition.

The Harley-Davidson Knucklehead, produced from 1936 to 1947, revolutionized the motorcycle world with its groundbreaking engine design. The Knucklehead's signature feature, its distinctive rocker arm design, resembled a clenched fist, hence its name. The engine, a 45-cubic-inch (740 cc) V-twin, featured a cast-iron cylinder block and heads, a single overhead camshaft, and a pushrod-operated valve system. This innovative design offered increased horsepower and torque compared to previous Harley models, making the Knucklehead a formidable machine on the road. Its sleek, streamlined aesthetics, with a teardrop-shaped fuel tank and a distinct curved front fender, further enhanced its appeal. The Knucklehead quickly gained popularity among riders, becoming a symbol of Harley-Davidson's dedication to engineering excellence. It was used in various applications, from police motorcycles to custom builds. However, its production was halted in 1947 due to the onset of World War II, which shifted manufacturing focus to war-related equipment. Despite its relatively short production run, the Knucklehead left an indelible mark on the history of motorcycles. It paved the way for future Harley-Davidson models, influencing their design and performance standards. Today, Knuckleheads are highly sought-after collector's items and prized possessions by motorcycle enthusiasts, captivating generations with their legacy of power, style, and engineering ingenuity.