This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1959 Harley-Davidson Hummer is a 125cc single-cylinder two-stroke motorcycle based on the DKW RT125. Following the Second World War DKW’s patents were released to the allies, and copies of the DKW were also made in the UK as the BSA Bantam, and in the Soviet Union as the MMZ M-1A Moskva, or Minsk. This example has been with the current owner for 15 years, and a recent engine rebuild, reportedly with new-old-stock parts, included a new piston, bearings, and seals. This Harley-Davidson Hummer is now offered at no reserve on behalf of the current owner with an Oregon bill of sale.
Though the American-made, single-cylinder two-stroke bikes are colloquially known as Hummers, only the lightweight 125cc Harley models made from 1955-1959 were actually branded as such. The basic DKW design was outfitted with a Harley-designed tank and fenders upon release as the Model 125 in 1948. This example is finished in red with white accents and a black frame and per the seller, has not been refinished.
The bike is equipped with a rigid rear-end and a sprung seat at the rear, and a telescopic front fork which was introduced in 1951. Braking is handled by mechanical drums front and rear, and the 18″ wheels are finished in black and fitted with 3.50″ Firestone tires.
This model is not equipped with a speedometer or a battery, and the upper plate on the triple clamp carries the Hummer name. Handlebar mounted controls include just a hand throttle and the clutch and brake levers. The seller estimates that about 3,000 miles have been added under current ownership.
While Harley’s other DKW-based models moved to a 165cc engine in 1953, the Hummer model carried over the earlier 125cc powerplant, which is paired with a 3-speed transmission. Hummers were built with a basic electrical system, with magneto ignition and no battery. This example was recently rebuilt by the current owner with a new piston, bearings, and seals. A factory air filter assembly has been retained, and close-up photos are provided of the engine case, cooling fins, and other driveline components.
A cold-start video is viewable above.