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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?

Four Valves for 1936-38 Douglas 500cc-600cc

Started by Dave, 07 Apr 2004 at 09:16

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Dave

Four valves to suit 1936-38 Douglas 500cc and 600cc engines. Might also fit Blue Chief and Endeavour models of 1934-35. Could also be shortened to suit 250cc-350cc engines.



Larger picture of above available here http://www.kynoch-douglas-parts.com/html/for%20sale/Douglas%20600cc%20valves.htm

Three of the valves have a "James" brand name on them while the fourth is labelled "1507 SC". Dimensions of the valves are 5/16" stem diameter, 1-1/4" head diameter and 4-7/32" length. The "1507 SC" valve is 4-3/16" in length.

Condition of the valves is very good as they have never been used. There are some small black spots in a few places - see close up photo here http://www.kynoch-douglas-parts.com/html/for%20sale/Douglas%20600cc%20valves%20close%20up.htm

All proceeds from the sale of these valves go towards hosting costs for this website. (see below)

Pricing as follows.

Anywhere in the world - US$20.00 plus postage US$9.00
Within Australia   - A$30.00 plus postage A$4.50

Insurance is optional.

These valves were kindly donated in support of this website by Martyn Hudson. Martyn is a Veteran Car enthusiast and runs a grease packing business (www.unette.co.uk). He regularly delivers to the old Douglas factory in Douglas Rd, Kingswood. He mentioned
Quote"You could still see the drawings of numerous components for the bikes on the painted walls in many of the storage areas and machine shops. The compressor house also has some interesting drawings."

Thank you Martyn for your kind donation.