Initial Hits

The next really notable two-wheeler was the Millet of 1892. It used a 5-cylinder engine built as the hub of its rear wheel. The cylinders rotated with the wheel, and its crankshaft constituted the rear axle.

The first really successful production two-wheeler though, was the Hildebrand & Wolfmueller, patented in Munich in 1894. It had a step-through frame, with its fuel tank mounted on the downtube. The engine was a parallel twin, mounted low on the frame, with its cylinders going fore-and-aft. The connecting rods connected directly to a crank on the rear axle, and instead of using heavy flywheels for energy storage between cylinder-firing, it used a pair of stout elastic bands, one on each side outboard of the cylinders, to help out on the compression strokes. It was water-cooled, and had a water tank/radiator built into the top of the rear fender.

In 1895, the French firm of DeDion-Buton built an engine that was to make the mass production and common use of motorcycles possible. It was a small, light, high revving four-stroke single, and used battery-and-coil ignition, doing away with the troublesome hot-tube. Bore and stroke figures of 50mm by 70mm gave a displacement of 138cc. A total loss lubrication system was employed to drip oil into the crankcase through a metering valve, which then sloshed around to lubricate and cool components before dumping it on the ground via a breather.
DeDion-Buton used this 1/2 horsepower powerplant in roadgoing trikes, but the engine was copied and used by everybody, including Indian and Harley-Davidson in the U.S. Although a gentleman named Pennington built some machines around 1895 (it's uncertain whether any of them actually ran), the first US production motorcycle was the Orient-Aster, built by the Metz Company in Waltham, Massachusetts in 1898. It used an Aster engine that was a French-built copy of the DeDion-Buton, and predated Indian (1901) by three years, and Harley-Davidson (1902) by four.