Harley-Davidson DUO-GLIDE 74 OHV 1959 Service Manual

Harley-Davidson DUO-GLIDE 74 OHV 1959 Motorcycle manual cover

Pages 140

Year 1959

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of 140

Harley-Davidson DUO-GLIDE 74 OHV 1959 Motorcycle Specification

The Harley-Davidson DUO-GLIDE 74 OHV 1959 motorcycle stands as a hallmark of engineering excellence and classic design. Powered by a 74 cubic inch (1200cc) overhead valve (OHV) V-Twin engine, it delivers robust performance and a distinctive exhaust note emblematic of Harley-Davidson motorcycles. The engine features a 45-degree configuration, air cooling, and a 7.25:1 compression ratio, producing approximately 55 horsepower at 4,800 RPM. This powertrain is coupled with a 4-speed manual transmission, offering a smooth and engaging riding experience.

The DUO-GLIDE 74 OHV is notable for its introduction of hydraulic rear suspension, a significant upgrade from the rigid frames of its predecessors. This innovation provides improved ride comfort and handling, making it a popular choice among long-distance riders. The front suspension utilizes a telescopic fork with hydraulic damping, further enhancing the bike's ride quality.

Its braking system consists of drum brakes on both the front and rear wheels, ensuring reliable stopping power. The motorcycle's frame is constructed from durable steel, contributing to its overall weight of approximately 565 pounds (256 kg). The DUO-GLIDE features a wheelbase of 60 inches (1524 mm) and a seat height of 26 inches (660 mm), offering a balanced and comfortable riding posture.

Aesthetically, the 1959 DUO-GLIDE showcases classic Harley-Davidson styling cues, including a teardrop fuel tank with a 4-gallon capacity, chrome accents, and a distinctive front fender. The bike is available in various color options, reflecting the era's vibrant automotive palette. The instrumentation is straightforward, featuring an analog speedometer and essential indicator lights.

Overall, the Harley-Davidson DUO-GLIDE 74 OHV 1959 is a blend of innovative suspension technology, reliable performance, and timeless design, making it a cherished model among motorcycle enthusiasts and collectors.

Harley-Davidson DUO-GLIDE 74 OHV 1959 Motorcycle F.A.Q.

How do I properly start the Harley-Davidson DUO-GLIDE 74 OHV 1959?

To start the 1959 DUO-GLIDE, ensure the fuel valve is open, switch the ignition to the 'on' position, and engage the kick starter with a firm motion. Check that the bike is in neutral before starting.

What is the recommended oil type for the 1959 DUO-GLIDE?

The recommended oil for the Harley-Davidson DUO-GLIDE 74 OHV 1959 is SAE 50 or SAE 60 in warmer climates. Always check the owner’s manual for the most suitable oil type for your environment.

How can I troubleshoot ignition issues on the DUO-GLIDE 74 OHV?

Check the spark plugs for fouling, ensure the ignition coil is functioning, inspect the wiring for damage, and verify that the battery is fully charged. Replace any components as necessary.

What maintenance should be performed regularly on the 1959 DUO-GLIDE?

Regular maintenance includes checking and changing the oil, inspecting the spark plugs, adjusting the carburetor, lubricating the chain, and checking the brakes and tire pressure.

How do I adjust the carburetor on the DUO-GLIDE 74 OHV?

To adjust the carburetor, locate the idle mixture screw and the idle speed screw. Adjust the idle mixture screw for optimal air-fuel ratio and the idle speed screw to maintain engine idling at the correct RPM.

How can I address a slipping clutch on the 1959 DUO-GLIDE?

First, check the clutch cable for correct tension and adjust as needed. If the issue persists, inspect the clutch plates for wear and replace them if necessary.

What are common electrical issues on the 1959 DUO-GLIDE and how can they be fixed?

Common issues include faulty wiring and poor connections. Inspect the wiring harness for breaks, clean and tighten all connections, and ensure the battery is in good condition.

How do I change the tires on the Harley-Davidson DUO-GLIDE 74 OHV 1959?

To change the tires, elevate the motorcycle securely, remove the axle nut, slide out the axle, and remove the wheel. Replace the tire, ensuring it is properly seated, and reassemble.

What should I do if the DUO-GLIDE overheats?

If the bike overheats, stop riding immediately to allow the engine to cool. Check the oil level and coolant system. Investigate potential causes such as a clogged oil filter or inadequate airflow.

How can I improve the fuel efficiency of a 1959 DUO-GLIDE?

Ensure the carburetor is properly tuned, maintain correct tire pressure, reduce excess weight, and ride at consistent speeds. Regular maintenance can also improve fuel efficiency.