Douglas - For Sale Items

Douglas 1913 Model P motorcycle

Douglas - Wanted Items

Douglas 1915 3 Spd-Gearbox and Clutch

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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?

Dave

2025-01-07, 19:16:39
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Dave

2024-06-11, 21:02:05
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Which screws do I need?

Started by Domas, 28 Sep 2022 at 18:15

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Domas

28 Sep 2022 at 18:15 Last Edit: 28 Sep 2022 at 18:46 by Domas
Which screws do I need? (see picture)Motorcycle is a 2 3/4 HP.

Jim

#1
04 Oct 2022 at 02:55
Hello Domas,
the upper screw is Douglas` own thread which is 25 tpi by 9/32 diameter and the lower is bsf 20 tpi by 3/8 a shouldered bolt to take the rear stand regards Jim

Jim

#2
04 Oct 2022 at 03:00
hello again I got it wrong that top one should be 17/64

Domas

#3
11 Oct 2022 at 12:07
Many Thanks.  You have helped me a lot!

Domas

#4
16 Oct 2022 at 15:46 Last Edit: 16 Oct 2022 at 15:56 by Domas
Hi Jim, what is 17/64? No thread! Wrench size?

Jim

#5
17 Oct 2022 at 02:20
Hello Domas,  17/64 by 25 tpi is a Douglas thread, head size is 7/16, regards Jim

Domas

#6
17 Oct 2022 at 17:19
Thank you.
Which thread is closest to 17/64" to recut?

cardan

#7
18 Oct 2022 at 00:57
Pity to lose the Douglas mystique: https://www.douglasmotorcycles.net/index.php?topic=1102.0

But if you must:
17/64-25 is 0.266"-25tpi
M7-1mm pitch is 0.276"-25.4tpi

Leon

Domas

#8
18 Oct 2022 at 08:39
I also use 2 screws. who has some for me?
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