The first aluminum cast rear frame around a central metal tube appears. With the 422, the 423S is the first Zündapp, manufactured in series, which is supplied with a strong central steel frame tube, which was pressed under pressure into an aluminum rear frame. This production method would remain the trademark of Zündapp for decades. These frames appear to be more stable and lighter than the usual metal tube frames or cradle frames.

Engine Type: 258 single-cylinder two-stroke.  Construction :: Block construction with attached gearbox.  Cylinder capacity: 49.9 cc.  Bore: 39 mm ø.  Stroke: 41.8 mm.  Cooling: Rijwind  Lubrication: Mixer lubrication 1:25  Carburetor: Bing.  Type: 1 / 9,5 / 53  Electrical installation: Noris  Type: Flywheel / magnet light and ignition system.  Power: 6 Volt 17 Watt.  Headlight: 6V 15 W  Rear lamp: 6V 2 W  Stop lamp: n.t.  Gear box:  Construction: The gearbox consisted of a planetary switching mechanism. This was a construction of gears in which the floating shaft and the driven shaft are aligned.  Number of Gears: 2 Hand  Front sprocket number of teeth: 11  Rear sprocket number of teeth: 41  Frame:  Construction: According to special process under high-pressure cast light metal.  Suspension for: Adjustable swingarm  Tire size: 23 "x 2.5"  Tire pressure:  Brakes:  For: Volnaaf drum brake.  Diameter: 90 mmø.  Rear: full hub drum brake.  Diameter: 90 mmø.  Fuel tank: Content 7.3 liters.  Reserve: ca.0.5 Liter.  Sizes and Weights:  Empty weight approx .: 55 KG  Permitted total weight: 230 KG

Performances: A: with a floating saddle and luggage carrier B: with buddyseat C: with a floating saddle and luggage carrier. Tires with "engine type" designation D: with a floating saddle. Tires with "engine type" designation