30 U, S. NATIONAL MUSEUM BULLETIN 2 04 



HARLEY-DAVIDSON MOTORCYCLE, 1913 



U. S. N. M. No. 313147; original; gift of Paul Edward Garber in 1947; photo- 

 graph No. 37759 ; plate 22, b. 



This motorcycle was purchased, seconclhaiul in 1U18 by the donor 

 and was used by him for several years. It was restored by the Harley- 

 Davidson Motor Co. in 1947. The engine number is 4336-D. 



It is equipped witli a 5-horsepower, 1-cylinder, 4-cycle, air-cooled, 

 gasoline engine of ^^/iQ-mch bore and 4-inch stroke, giving a total 

 piston displacement of 35 cubic inches. Known as the model Nine 

 B, "5-35," it sold for $235 at the factory in Milwaukee, Wis. 



The cylinder casting and its integral head are of heat-treated gray 

 iron. The piston is heat treated and ground and is fitted with three 

 piston rings and a hollow, steel wrist pin. An I-beam section of 

 chrome-vanadium steel, fitted at both ends with phosphor-bronze 

 bushings, serves as the connecting rod. Separate camshafts for the 

 intake and exhaust valves are driven by gears in the magneto drive 

 train. The overhead, intake valve is of nickel steel, while the 2-piece 

 exhaust valve has a cast-iron head and a nickel-steel stem. The crank- 

 case is of polished aluminum, with the hardened, tool-steel crank- 

 shaft mounted in it in phosphor-bronze bearings. An oil drain plug 

 and an overflow pipe are provided in the crankcase. 



Ignition is by Bosch high-tension magneto with spark plug, and the 

 fuel is vaporized by a constant-level, float-equipped, Schebler car- 

 Iniretor. A priming petcock is located in the left side of the cylinder 

 head. A 2-section tank, one for gasoline, the other for oil, is mounted 

 at the upper bars of the frame, above the engine. Filler caps and 

 shut-off metering valves are located on top of both tanks. The lubri- 

 cating oil for the engine passes by gravity through a sight glass 

 into the crankcase. Ignition and throttle are controlled by twisting 

 the grips of the handle bars, the left for spark timing, the right for 

 throttle opening. 



The loop-type frame of brazed and welded steel tubing forms a 

 cradle to support and protect the motor. Tubular handle bars are 

 attached to a steering fork fitted with both main and recoil springs. 

 The wire-spoked, metal-rimmed wheels now mount 28-by-3-inch 

 clincher tires, though the original tires were 28 by 21^ inches. A 

 metal mudguard is located above each wheel, and a stand is supplied 

 at the rear of the frame. Beneath the saddle is a metal tool box, and 

 below the box is a muffler connected to the exhaust port by a curved 

 pipe. The wheel base is 57 inches. 



The rear wheel is driven by a double-reduction roller chain from 

 a sprocket on the engine crankshaft to a sprocket on the left side of 

 the rear-wheel hub, which is equipped with a clutch operated by a 



