The 45° F-Head V-Twin

Harley-Davidson soon realized that the easiest way to significantly increase engine size was to add an extra cylinder. The company built a prototype V-twin in 1907 and four years later the first production V-twins rolled out of the factory. The engine effectively joined two singles on a common crankshaft and cases. If the angle of

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1915 KR Fast Roadster

SPECIFICATIONS. 1915 KR Fast Roadster Engine: Inlet-over-exhaust, V-twin Capacity: 6l cu.in. (1000 cc) Power output: 15 bhp Transmission: Single-speed competition gearbox, chain drive Frame: Tubular loop Suspension: Leading-link front forks, rigid rear. Weight: 325 lb (147kg) Top speed: 80 mph (130km/h) THE IDEA OF A RACE BIKE on the road has always been attractive to

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1915 KT Board Racer

SPECIFICATIONS. 1915 KT Board Racer Engine: Inlet-over-exhaust, V-twin Capacity: 61 cu.in. (l000cc) Power output: 15 bhp Transmission: Three-speed, chain drive Frame: Tubular loop Suspension: Leading-link front forks, rigid rear Weight: 325 lb (147kg) Top speed: 80 mph (130km/h) Harley-Davidson did not participate in team racing until 1914, when it decided to exploit the potential benefits

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The Early Single-Cylinder gasoline engine

The Early Single-Cylinder gasoline engine was underpowered and inefficient, though Harley’s singles were among the best available. The “atmospheric” inlet valve relied on a light spring to keep it closed and was forced open by the pressure created from the falling piston. The system was simple, but it couldn’t work properly at anything other than

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1912 Silent Gray Fellow

SPECIFICATIONS 1912 Silent Gray Fellow Engine: Inlet-over-exhaust, single-cylinder Capacity: 30cu. in. (494cc) Power output: 6.5bhp @ 2,700rpm Transmission: Single-speed, belt drive Frame: Tubular loop Suspension: Leading-link forks, rigid rear Weight: 195 lb (89kg) Top speed: 45mph (72km/h) By hie time Harley-Davidson built this X-8 single in 1912, the company was well on the way to

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1905 Model No.1

SPECIFICATIONS 1905 Model No.1 Engine: Inlet-over-exhaust single Capacity: 24.74cu. in. (405.41cc) Рower output: Unknown Transmission: Single-speed, belt drive Frame: Tubular loop Suspension: None Weight: 185 lb (84kg) Top speed: 40mph (64km/h) (est.) MOTOR AND CYCLE There wasn’t much more to the first Harleys than these two vital ingredients. Though William Harley and the Davidson brothers

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