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Douglas 1913 Model P motorcycle

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Douglas 1915 3 Spd-Gearbox and Clutch

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Dave

2024-06-11, 20:02:05
Have you tried the new Drafts feature yet? I just lost a long message today and learned my lesson. It is a good idea to save a draft of any long post you are writing. You can then just keep writing and keep saving a draft, knowing you have a backup if there is a glitch. The draft is automatically deleted when you post the message.

Dave

2024-06-08, 18:30:04
For Sale
xman has two very nice 1950's machines available - a green 1950 mk4 and black 1951 mk5 - both in good condition and running well.

Dave

2024-06-07, 02:13:36

Dave

2024-06-03, 08:23:05
For Sale
Duncan has just listed his green and cream 1957 Dragonfly for sale with spares and documents.

Dave

2024-06-02, 08:34:05
Parts avalable
alistair still has parts available - barrels, carburettor, castings - see all listings.


Dave

2024-06-01, 18:33:27

Dave

2024-05-28, 00:09:46
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Four speed gear box thread

Started by Michael Scott, 29 Apr 2008 at 13:42

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Michael Scott

Could any one tell me what the thread on the kick start end of the main shaft in a four speed gear (1930) is?
It is 20tpi and the od I get with my trusty mic is 0.455 inches

Chris's very useful complilation does not have it and he tells me that he does not have one to inspect

Michael

Chris

     To help out another member who has lost parts of his kickstart mechanism on the road during a run, I have just stripped off the parts from my CW to take some dimensions etc. and find that the left hand thread on the end of the gearbox shaft retaining the ratchet mechanism is the same as that measured by Mike for the four speed box. I actually made it 0.453"x 20tpi. I wonder if this is another Douglas Special as this corresponds with 29/64". Chris.

Michael Scott

#2
Quote from: Chris on 07 May 2008 at 17:30
   .... have just stripped off the parts from my CW to take some dimensions etc. and find that the left hand thread on the end of the gearbox shaft retaining the ratchet mechanism is the same as that measured by Mike for the four speed box. I actually made it 0.453"x 20tpi. I wonder if this is another Douglas Special as this corresponds with 29/64". Chris.

Thanks -.  will consider this over the weekend
michael

Edit 09/05/2008: Quite tags modified. A.

trevorp

.445 in some categories is 5/16 but cant find 20 tpi anywhere must be a douglas special