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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?

1914 2 3/4 2 speed chain gurad

Started by Chris54, 22 Jul 2015 at 19:40

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Chris54

Hi All

I am trying to find out what the chain guard looked like on a 1914 2 speed.

I have a 1913 to 1923 parts list but the guard for 1914 is not shown nor even listed, part 1806D "Stud securing cahin guard to engine 1913-19 is listed suggesting there was a chain guard that extended from in front of the front sprocket to the gearbox as a part 651D Chain guard stay (two-speed) 1913-19 is also listed but no Chain Guard.

Did my machine even have one as the position for the stud on the crank case has never been drilled and tapped.

Any information would be helpfull

regards Chris

Black Sheep

Chris, are you wanting a close-up picture of a 1914 2 3/4 with a chainguard? I'll pop up to the shed with a camera.

Chris54


Black Sheep

This one is 1913 - hopefully the same.

Black Sheep

And another

Black Sheep

And from the front.

eddie

Hi,
    Just to add a little confusion, some of the 2¾'s had a cast boss on the crankcase just under the front barrel, and a cast/forged bronze lug on the chainguard as a front fixing. In which case, the bracket onto the rear crankcase stud would be omitted.
  Regards,
              Eddie.

Chris

Hi Chris
Not very original but an easy way to replicate these chain guards is to make them from plastic. Take a length of 25mm electricians black plastic conduit. Using a bending spring and warming the plastic tube in boiling water the correct radii to suit the front and rear sprockets can be formed the correct distance apart. Mark out the sides of the tube on the halfway mark then carefully cut along this line with a hacksaw. file up the edges and shape each end nicely. Indistinguishable from original in appearance and will not rust. can be polished or painted. Alternatively you can use copper pipe for greater rigidity but more difficult to cut neatly and has to be painted. Chris.

Chris54

Thank you all for the pictures comments and suggestions, as the crank case has not been drilled and tapped i will make a guard with bracket that attaches to the rear upper crankcase bolt.

Thanks to you all, Chris