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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?

1930 S6 brakes

Started by Michael Scott, 15 Jan 2008 at 16:13

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Michael Scott


I am making progress with my restoration from an 80% pile of bits and now trying to solve missing bits on the brakes.
Can any one let have a picture or drawing or details of the bit(s) that hold the brake actuating arm to the brake shoe bobbin and the back plate?
Michael Scott

Stuart Lister

Hi Micheal,
Check out this recent post, I think it shows what you are asking for.

Stuart Lister

Quote from: Stuart Lister on 15 Jan 2008 at 22:37
Hi Micheal,
Check out this recent post, I think it shows what you are asking for.

Sorry, I forgot to include the link. Here it is

https://www.douglasmotorcycles.net/index.php/topic,2440.0.html

Michael Scott

Quote from: Stuart Lister on 15 Jan 2008 at 22:43
Quote from: Stuart Lister on 15 Jan 2008 at 22:37
Hi Micheal,
Check out this recent post, I think it shows what you are asking for.

Sorry, I forgot to include the link. Here it is

https://www.douglasmotorcycles.net/index.php/topic,2440.0.html
:)

Stuart
Many thanks. exactly what I need.  Do you know what the thread on the bolt is?  25tpi I bet!
Regards
Michael

Michael Scott

Now I look more carefully I am still missing a part.
My spool piece on the brake shoe has a clean 0.25 hole and I guess the new bolt is also a 0.25 and goes through.
I need something to screw into and thus locate and retain the assembly to the back plate.  I only a 0.25 clearance between the spool and the back of the drum.

Any thoughs or picytures anyone?
Michael

Stuart Lister

Hi Michael,

The bolt is quarter inch bsf 26tpi, and the back of the spool ought to have a female thread to match. Can't explain why yours should have a "clean" hole straight through.

Hope this helps,

Stuart

Doug

Michael,

Someone drilled through the bobbin. Perhaps they were switching the bobbin from one hand into the other. I have seen bobbins where the hole in the center had been filled with weld and re-drilled and tapped, and you can do the same to repair yours.

-Doug

Michael Scott

 :lol:

Stuart/Doug
Many thanks for the rapid and very useful responses
I was drifting into your explanations as a solution for my situation so its nice to know I will be doing it to original design.

Michael