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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?

primary chain lube system

Started by Douggy29, 01 May 2022 at 10:57

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Douggy29

01 May 2022 at 10:57
Hi All
I have an S5 that I am reassembling and am confused with what I found in this lube system. as I understand it oil mist travels along a horizontal gallery from the timing case where it exits through the chain case onto the chain. Some where in the latter parts there is a brass cup restricter that limits the oil. Near where the mist leaves the crankcase is a diagonal hole back into the crankcase which is in the shape of a funnel. Somewhere this brass cup goes in, I think with a spring and ball valve.
My questions are how does the brass cup fit?, What size hole is in it? (feeling mine might have been doctored) Originally it seemed to have been blocked up on purpose??? I can find little reference to the layout. Can anyone help please. Diagrams, hand drawn are good.
Many Thanks
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