Kreidler made in Germany by Kreidler Kreidler 2-speed
Kreidler is known for it’s 50cc road racers from the 1960’s and 70’s. With riders Hans-Georg Anscheidt, Jan de Vries, Henk van Kessel, and Eugenio Lazzarini, they were FIM World Champions in 1961, 1971, 1973, 1974, 1975, 1978, 1979, 1980, 1981, and 1982. Those racing Kreidlers were not mopeds (except the very first one), but they did have the same size pistons: tiny. In 1974 Henk van Kessel did a lap around the Belgian Gran Prix at an average speed of 101.7mph. That is unbelievably fast.
The Kreidler Flory mopeds are two speed automatic (Zwie gang Automatik, or ZA). Like the Puch and Tomos they have two centrifugal automatic clutches, in a transmission oil bath compartment, one that gets the bike moving forward, and another that lets it shift automatically between first and second (low and high) gear, according to the rear wheel speed. Roughly speaking, below 15mph it’s in first gear and above 15mph it’s in second gear.