Dutch English
Information
About Yesterdays
Our showroom
General conditions
Related links
Route
FAQ
Contact Us
Manufacturers archive and for sale
Quick Find Archive and for sale
 
Use keywords to find the product you are looking for.
Advanced Search

Douglas 1921 4hp 600cc 2 cyl sv SOLD
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge

Douglas 1921  4 HP      596 cc   side valve flat twin       frame# 14949      

This Bristol-based firm developed the horizontally opposed fore-aft unit in about 1907 and continued utilising this engine layout  well into the thirties. 
The earliest Douglas models had direct belt drive, but in 1910 a two-speed gearbox was added, with the control on top of the petrol tank. Douglas machines became very popular because of their lightness,  ease of starting and speed: in the 1912 Junior TT races Douglas took first, second and fourth places. 
In the First World War  thousands of  2 ¾ HP machines were commissioned for use by despatch riders and  performed splendidly. 
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. 
To sum it up: quite another machine! Between 1916 and 1921 hardly any changes were made. 
At the 1921 Olympia Show the company remarked: “ The 4HP Douglas remains practically unaltered for the experience gained during the war under extremely unfavourable conditions has made the machine eminently satisfactory in its present form.” The 4 HP disappeared from the range in 1924. 
Note the connection pipes between inlet manifold and exhaust, a feature to preheat the  incoming air. 
This  4 HP is an older restoration with a nice patina.

 
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Douglas 1921 4hp 600cc 2 cyl sv
Click to enlarge
Copyright © - Your Concept - powered by My Webshop - webwinkel