Douglas - For Sale Items

Douglas 1913 Model P motorcycle

Douglas - Wanted Items

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
Welcome to the new site!
Recommended viewing for a fast start...
 - Quick Tour of the Front Page
 - Quick Tour of the new Attachments
Learn all about attaching photos in the User Guide. Any problems with anything please Contact us     Faulty links fixed - 01June2024

Recent posts

#51
General Douglas Discussion / Re: kickstart mk4/5
Last post by eddie - 06 Jun 2024 at 18:38
Mike, the kickstart on the Mark series incorporates a bendix arrangement to engage it. The engagement is controlled by a short spring. If the spring becomes weakened, the engagement becomes erratic. If you dismantle the bendix, adding a shim washer to the spring will increase the pre-load and overcome the problem. Unfortunately, this dismantling means you will need to re-time the kickstart gearing to get the kickstart lever to come to rest in the required position.

  Regards,
               Eddie.
#52
General Douglas Discussion / kickstart mk4/5
Last post by mikelarcombe - 06 Jun 2024 at 16:32
Hi i am having the problem of the kick star not always engaging and slipping under pressure on several occasions  when trying to start making starting quite difficult, as you get many slips i see this involves 3 parts  as they recommend you fit both bevels and a pinion, any advice as to cost or if i may get away with one part only or two thanks for any inro forth coming cheers mike 
#53
This is what one might do if things get desperate. I know Bert Munro from New Zealand, during his life, he cast many pistons, including those for his 1920's Indian Scout, on which he took the world speed record for  under 1000cc. I think the record still stands!

There are a whole lot of videos on YouTube of folk, mostly in the USA, who DIY melt aluminium with homebrew kit, and make castings. I don't (yet) know anybody near me who melts stuff, but that is for later. Here is the beginnings of a plan.

We might use a variant of the "lost wax investment casting" method. This is not a new thing. Earliest examples were from 6500 years ago. What might be new is to use common PLA, or PVB filament plastic, and use a 3D printer to create the piston shape. Then use the plaster, or whatever other investment material set around it. The dried investment chunk is (slowly) heated to near 100C to drive off any water, then heated to red heat to melt out, and burn away all the plastic. Finally, using 4032 aluminium salvaged from old car pistons, the blanks are cast. Plural, because one needs two of them.

Stages are:
1. Make a CAD model of the oversize piston blank. I am OK with this using FreeCAD.
2. Persuade the CAD to output the correct code file for the 3D printer. This option is standard.
3. Get the pal with the 3D printer to make two patterns. I already found him!
4. Make the investments, with gas sprues, and bottom fill with flare. (Need help here!)
5. Do the burnout, leaving clean white casting molds (moulds??)
6. Melt the old pistons, with some extra to fill the sprues, and make the casts
7. Cut away all the extras, and start machining.

OK - I do have access to a lathe. One can turn the (slightly tapered) piston, and then, using a 4-jaw chuck set slightly eccentric, modify the skirt sides to become the correct oval. This is only a few thousandths inch done on the sides at right angles to the pin, in 3 stages 30°,60° and 90°, then blended in with emery strip.

All the above is not yet reality, and I have no idea the notion is even viable. It seems a whole lot of trouble to go to to re-create some Douglas pistons that are just unobtainium. (See other post "Rare Pistons"). Getting a pair made, and imported from Australia would cost the thick end of £800 by the time it make it to UK, and that is simply not going to happen!

So - can this plan work? Feel free to say no!
#54
Hi Bob,
There were two more parts to the story in the Motor Cycle, in the June 4 and June 11 editions. I checked a few slabs of text, and they were the same as the story as reproduced above,
Cheers
Leon
#55
"The MotorCycle" printed the Grady story in sections. It started in their May 28th, 1925 issue and goes to where he was "bushed" at Inveraray. It finishes "to be continued ".
I don't have all the relevant issues so don't know how many parts they sliced the original story in to. I just have the start.
It is slightly different to the one Doug put up above. For example, the "Banjo" story is cut short to " There followed a series of gruesome murders". Just minor editing I know but what else was done?
Personally I think Grady did the trip and even if he did polish the apple here and there it was a phenomenal effort.
My dad was stationed in Katherine at the Railway Workshops in 1944-45 and the family still have photos of the time. Twenty years after Grady went through it was still wild and woolly and that's being polite.
A.W.Grady has my deep respect.
Cheers,
#56
Hi Alistair,
Quote... its easier than this website.
Have you tried the new attachments process yet? It is a lot easier and quicker than the old one.
There are two ways to attach photos now, both can upload ten photos in one go.
A 2 minute video and transcript showing the simplest way to do it - Simplest method of attaching files to your message

Dave
#57
i have sent you a couple of emails with photos of the cleaned up valve seats.
let me know what you reckon (via email)
cheers .
alistair.
#58
Hi Alistair

My email is ericsinaus@yahoo.com.au

Are there 2 different sets of barrels (4) because a pair the fins are complete and in the other photo one of them looks like the fins on the head are all broken.

Can you give me your Phone number so I can call you. to get this clear.

Thanks

Eric
#59
they are fairly greasy and dirty.
i will give them a clean up and inspection on the valve area and let you know.
do you have an email address i could send further photos to? its easier than this website.
#60
Does anyone know how to contact Alan Cunn.
I've tried through his listing on this site but no response. I understand he is not well but has a large collection of gear that he may be clearing out. 

Im after 2 x TS 350 1924 cylinders.

Any help would be appreciated.

Im in Aus and Alan is in Nth QLD.