Recent Posts

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11
Douglas Motorcycles - General Discussion / Re: 2 3/4 hp frame date
« Last post by Hutch on 16 Nov 2018 at 04:06  »
Hi Chris,

Looks to be 1915 to circa 1919 to me. Rear stand mount design makes it post 1914.

Cheers

Ian
12
Douglas Motorcycles - General Discussion / 2 3/4 hp frame date
« Last post by Chris (Sprinter) on 15 Nov 2018 at 22:26  »
Hello All,

Can any of the more knowledgeable members (than me)of this forum date this 2 3/4hp frame please? I have a frame number but it does not seem to correspond with some of the features of the frame that I believe to be veteran or during WW1. Maybe someone could tell me their opinion before I reveal the number.

Thanks in advance

Chris
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Identifying Douglas Motorcycles / Could you help me identify the model
« Last post by SMARTIT on 15 Nov 2018 at 17:30  »
Hi.  Just found a picture of my Grandad and Nana astride what I believe to be a Douglas bike.  Could anyone help me identify the model and where I might be able to see one in the UK.

Many thanks in advance.
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Douglas Motorcycles and Parts Wanted / 5-16 18 Whitworth Bolts
« Last post by Eric S on 15 Nov 2018 at 10:54  »
Anybody can get 5/16-18 W bolts for a 600 Aero's engine heads?
Would need a complete set for both cylinders.

Any help welcome.
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Douglas Motorcycles and Parts Wanted / Re: Mark V swinging arm wanted
« Last post by stclair on 14 Nov 2018 at 16:37  »
Neil

I may have a filler cap for the Mark tank but it would be Saturday before I can check
16
Douglas Motorcycles - General Discussion / Re: Douglas Aero 1937
« Last post by Doug on 14 Nov 2018 at 16:25  »
Eric,

The tank capacity came from their catalog information, so would indeed be Imperial units vs. US. When in Rome, as the Romans do...



I did not make any extra of the Aero head bolts at the time (it was 25 years ago),  though these days when I do make something like that I often run off a few extras when I have the machine set up. I do not have any plans to run them again as I have too many other things to machine, but could provide a drawing if you can get them machined locally. Otherwise it would be a matter of advertising here or in the LDMCC magazine.

Unfortunately, and for no good reason I can see, the head bolts are different between the 500/600cc Aero and the 250/350cc Aero.



Both 5/16 diameter, but one a fine thread and the other coarse. Also different lengths, height of dome, and even diameter of the washer. They could well have used the same bolt for all four engines, but did not. Which is a pity as quite a few of the 250/350cc engines have been scrapped looking for crankshafts and conrods that can be altered to keep the 350EW running, so someone might have saved some cylinder bolts and other hardware. However they will not do you any good for a 600.

As you can see, no trace of plating, so original finish would have been black stove enamel.

-Doug


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Douglas Motorcycles - General Discussion / Re: Douglas Aero 1937
« Last post by Eric S on 14 Nov 2018 at 14:31  »
Doug

Thank you for the information. I am assuming that is Imperial gallons and pints even if it do not make a huge difference with US standards.
Any idea about the head bolts? Any spare to spare? Anybody knows where we can get them?
18
Douglas Motorcycles - General Discussion / Re: Douglas Aero 1937
« Last post by Doug on 14 Nov 2018 at 13:42  »
Eric,

3.5 gallons fuel and 3 pints oil.

The lack of leaded fuel is generally not a problem unless you run high mileages or run the engine hard for continuous periods such that exhaust valve seat overheats and starts to transfer metal to the valve (valve seat recession). Leaded fuel, introduced in the thirties, helped combat that.

The increasing use of ethanol in fuel is a more significant issue, and you may find you will have to alter the carburetor settings to compensate. There have been quite a few posts on that topic relating to the postwar models.

-Doug
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Douglas Motorcycles and Parts Wanted / Re: EW hubs
« Last post by GlennMckenzie on 14 Nov 2018 at 11:30  »
I think I have a couple of EW Hubs somewhere if you are still looking?
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Douglas Motorcycles - General Discussion / Re: Douglas Aero 1937
« Last post by Eric S on 14 Nov 2018 at 07:49  »
What are the tanks capacities?
I will have the tanks treated with a resin and I need to get that information to order the right kit.
The reservoir is well made of steel (not aluminium)?
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