Manufactured by Maschinenfabrik Stein AG, Frankfurt/Main, 1922-1925.
If a two-stroke was described has having eight ports and a rotary inlet, it would not sound terribly antique. That was the 198cc engine which powered the Dolf.
The Dolf first raced at the Opel track in 1922. It won, and for the next few years it was top of the class.
Designed by Victor Grassmann the engine was built in-house, as was the frame, front fork and many other components. The road machines had an integrated center stand which allowed the rider to change both wheels without assistance. The rear wheel could be removed after loosening the axle nut, making it one of the earliest examples of the "QD" system.
Models:
Model B
250 cc, 65 mm x 75 mm b/s, 4 h.p.,
Chain drive, two-speed gearbox, unit construction, neutral, clutch, kickstarter
Available for the 1924 season
As the economic climate worsened and hyperinflation bit deeper into the pockets of customers, sales slumped. Production was halted in late 1924, and the company was dissolved sometime after September 1930.
Sources: Tragatsch p118, et al; Motopedia.
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