**1940-1947 Harley-Davidson Big Twins Knucklehead / Flathead**

**A Timeless Masterpiece of American Engineering**

**Technical Overview**

The Harley-Davidson Big Twins, produced between 1940 and 1947, represent an iconic era in motorcycling history, embodying the raw power, reliability, and aesthetic appeal that have come to define the Harley-Davidson brand. These legendary machines, known as the Knucklehead and Flathead models, boast a distinctive design that has captivated generations of riders and collectors alike.

**Engine**

At the heart of these Big Twins lies the iconic air-cooled V-twin engine. The legendary "Knucklehead" engine, introduced in 1936, features a unique rocker box design reminiscent of clenched fists, giving it its unmistakable name. Its successor, the "Flathead" engine, introduced in 1941, replaced the angled valves with parallel valves and a flattened combustion chamber for increased efficiency and performance. Both engines deliver ample torque and power for effortless cruising and thrilling acceleration.

**Driveline**

The power from the V-twin engine is transmitted through a robust 4-speed transmission that offers smooth shifting and reliable operation. The primary drive consists of a chain or belt, while the final drive utilizes a shaft drive for efficient power transfer to the rear wheel.

**Suspension and Braking**

The Big Twins feature a sturdy frame and a suspended rear end for enhanced stability and handling. The front suspension utilizes a girder fork with hydraulic dampers, providing a smooth and responsive ride. The rear suspension employs a swingarm with coil-over shock absorbers, ensuring a comfortable and controlled ride even on uneven terrain. Drum brakes on both wheels provide adequate stopping power, further enhancing the bike's safety and control.

**Styling**

The Big Twins' distinctive styling has become synonymous with Harley-Davidson's iconic image. The teardrop-shaped fuel tank, the streamlined fenders, and the classic peanut-style fuel cap exude timeless appeal. The bikes' imposing presence is further enhanced by the large V-twin engine, the staggered dual exhaust pipes, and the bold Harley-Davidson badging.

**Legacy**

The 1940-1947 Harley-Davidson Big Twins Knucklehead / Flathead continue to be highly sought-after by collectors and enthusiasts around the world. Their enduring popularity is a testament to their exceptional engineering, enduring style, and the rich heritage they represent in the annals of motorcycling. These machines embody the spirit of American craftsmanship and the timeless allure of the Harley-Davidson brand.

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This Workshop Service Repair Manual contains all the technical information you will need to properly perform all repairs.

This Workshop Repair Manual includes detailed information for every repair procedure making all service and repairs simple.

The easy to read exploded views and diagrams found in this Workshop Repair Manual make for easy identification, disassembly/re-assembly, accurate adjustment, and correct repairs.

This Workshop Service Repair Manual also contains illustrations, diagrams, specifications, step by step instructions, pictures, procedures and much more.

1940-1947 Harley Davidson Big Twins Knucklehead / Flathead Service Repair Workshop Manual Download! 1940 1941 1942 1943 1944 1945 1946 1947

Applicable Models Covers:
O.H.V Engine: 61 Cu. In. (1000 c.c)
74 Cu.In. (1200 c.c)
Side Valve Engine: 74 Cu.IN. (1200 c.c)
80 Cu. In. (1300 c.c)
Big Twins Models (back to 1937)
Production model years:1940 1941 1942 1943 1944 1945 1946 1947

Service Repair Manual Covers:
- Trouble Chart
- Initial Servicing of New Motorcycle
- Engine Lubrication
- Engine Overhaul
- Electrical System
- Servicing Carburetor
- Transmission
- Wheels & Hubs
- Fork, Frame & Handle
- Sidecar
- Detailed Index

PRODUCT DETAILS:
Total Pages: 166 pages
File Format: PDF
Compatible: All Versions of Windows & Mac
Language: English
Printable: without any restriction
Delivery: Download link will appear on the checkout page after payment is complete.
Requirements: Adobe PDF Reader

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