The Douglas 2 ¾ hp (or 350cc) was and still is one of the nicest little engined vintage motorcycles out there. The horizontally opposed twin cylinder is very smooth and whether as a 2 speed or 3 there was very little that would challenge this demon machine. Its major downfall would be the slipping final drive belt when worn or out of adjustment but by 1925 the Model CW had arrived with chain final drive.
This handbook was produced by the Douglas Motors in Bristol in 1925 and covers all the 2 ¾ hp machines from 1911 to 1925. It includes the variations between the early and later models and what parts are interchangeable.
Included is the various different carburetters that the 2 ¾ used, the AMAC vertical carb designed specifically for the Douglas 2 ¾ , the Douglas Automatic Carburetter and the Binks 2 jet carburetter. It also has the AMAC carb jet sizes. There is a good coverage of the different types of clutches and gearboxes used – no clutch, flywheel clutch, gearbox clutch, and 2 or 3 speed gearboxes. I wish I had a copy of this manual when I owned my Douglas, life could have been much easier. At 100 pages there is very little left to be said about the mighty 2 ¾.
Click on the front cover below to see the complete manual.
It is quite a big PDF at 10M and of course you will need Adobe Acrobat Reader to view it.
Click here to see the copy of the 1920 Sales Catalogue with the 2 ¾ hp models.