Yesterdays Antique MotorcyclesThe Netherlands
Douglas 1923 4 HP 596 cc combination
In 1915 a 596 cc model was introduced to cater for the need for a more powerful sidecar puller. A notable difference in engine design with the 2 ¾ HP model is the wet sump oiling system. A year later the 4 HP model was improved in a number of ways. To mention a few: other front forks, new design of exhaust, frame and tank alterations, front and rear brake changes, many small engine design improvements.
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