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Douglas 1913 Model P motorcycle

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Douglas 1915 3 Spd-Gearbox and Clutch

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Lat Fuller

2025-07-20, 02:39:50
I am pretty desperate for a rear cylinder for my veteran Douglas 1917 2 3/4hp "W" model.   I there is anyone who may have one of these that can be re-sleeved or know where I may find one I would be very pleased for the help.  I have a number of engine parts that I can exchange such as matching crankcases, conrods, crankshaft, flywheel etc. Any help appreciated.

Lat Fuller

2025-06-04, 05:57:00
Does anyone have the specifications for the oil inlet valve spring for early 2 3/4 engines - Part number 424.   I have tried to order one from the club spares but apparently Jeff Swan is indisposed at the moment.

skapoor

2025-05-19, 09:23:12
I am looking for a carburettor for veteran Douglas motorcycle engine-13651. Could you please help me with this?

Timing Gears.

Started by phil1, 25 Nov 2019 at 19:46

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phil1

Hi Friends I would just like to know where these timing gears came from! I have an identical pair taken from a MK engine,and  can  see that they are wasted in the centre and therefore very much lighter in weight than others I have seen. Many thanks.  Phil1ftp://.           

eddie

Hi Phil,
            They are probably from a wartime Douglas Generator engine.

   Regards,
                  Eddie.

phil1

Hi Eddie thanks for your reply re pre war timing gears. My next thought is as they look in pretty good shape and considerably lighter, bit like pre unit (Triumph) I would like to use them in the MKV. Regards Phil.

eddie

Phil,
       I have heard of owners using them in Mark series engines, but I would suggest you compare them carefully with a set of genuine Mark camwheels - the timing marks may not be in the same position relative to the keyway! I know for a fact that the crankshaft gear looks the same as that on a Mark, but one has the keyway in line with a tooth and the other has the keyway between 2 teeth. There are, however, advantages to using these gears - being from a generator engine produced under a government contract, the materials used were to a higher spec than those used in the motorcycle engine.

   Regards,
                   Eddie.