Manufactured by Amo-Motoren-Gesellschaft mbH, Berlin-Schöneberg, 1950-1954.
These were bicycle attachment engines. (Hilfsmotoren or Fahrradmotor).
Distributed in Sweden by Aktiebolaget FACO Valhallavägen 75 Stockholm as the "amo cykelmotor"
Amo engines were used by a number of other powered bicycle builders including Brage of Hedemora, Meyfa Teddy of Berlin-Reinickendorf and Mustad of Denmark, Norway and Sweden.
Under the TX brand an ancestor of the company, Westendarp & Pieper, built a 146cc twostroke from 1921 to 1924. They were belt-driven with rim brakes and a very short exhaust which ended in front of the crankcase. See TX
The company also built 50cc two-stroke mopeds which in 1951 were named the "Amoped" and another around the same time named Amoretto.
A translation of an excerpt from an Amo catalog from 1950 reads:
The reliable, hill-climbing bicycle auxiliary motor with ample power reserves. Rudolf Ahrens, manufacturer of the world-famous TX record motorcycle, now builds the Amo. Tax-free, registration-free, and drivable without license plates. The amo bicycle auxiliary motor from the renowned engine designer has passed with flying colors. For about a year now, hundreds of "amo" motors have been running reliably like clockwork in icy cold and tropical heat, in lowlands and mountains, to the delight of their owners worldwide. Its instant starting at any temperature, its fabulous acceleration, its hill-climbing prowess, its unparalleled endurance on long journeys with heavy loads, its liveliness and reliability make everyone who has ever driven it an enthusiastic "amo" fan.
Sources: Tragatsch p74; GTU; mo-ped.se; motor-lit-berlin.de.
N.B. There was an unrelated AMO company in Munich in the 1920s. See Disambiguation
