If the jet block is slack, there would seem to be three likely culprits, the first is that the carb body is worn or distorted, or the second that the jet block is worn and finally a combination of both, do you have a spare jet block to try, or compare the one in use to. If not I think I may have a spare block you could borrow unfortunately not sure where it may be, will have a search tomorrow to or Monday and let you know. 

Just an update.  Please find photo dated 1956 mentioned previously for interest.
Logbook shows first registered January 1923, which goes with the comment from Hutch about the 23/24 model having the mounting there.

Quote from: eddie on 23 Apr 2025 at 12:53 Providing that small drilling connects to another drilling, it should be OK. Regarding the fibre washer under the let block - the original was of a soft material that often disintegrated as the base nut was unscrewed. It can be replaced with a red fibre washer, but it needs to have a large bore so that it doesn't obstruct any drillings in the base of the jet block. While you have the jet block out, check that the small drilling in the bottom of the main bore of the carb body is also clear. The drilling is at an angle up from the slow running screw into the main bore.

  Regards,
              Eddie.

  P.S. The jet block fits direct against the bottom of the carb body - there is no washer needed between the two.

Thanks Eddie. After swapping carburettors the problem switched to the other side. First I checked carburettor body holes and all were clear. Anything else you can think of? I can get the carburettor refurbished to fix the loose jet block etc. which is all I can think of

Quote from: yosemite on 19 Apr 2025 at 22:32 Have you tried swapping carbs from one side to the other, if the fault migrates then the problem is with the carb if not the problem lies elsewhere.

Hi Yosemite, yes, just swapped carbs around today and the problem migrated. I have cleaned thoroughly jet block holes and the holes in the carburettor body, all clear. The only thing I can do now is send the carburettor away for refurbishment and get a sleeve put in for the loose jet block. Any other ideas? Thanks 

Thanks very much for that Hutch.  The needle valve fitted a treat.
Also found an old photo of father-in-law on the m/c dated 1956 at a local club day and the generator can just be seen mounted below the saddle behind his leg.  Failed to find anything resembling the support bracket but can make one up to enable all the parts to be assembled.
Have attached recent photo with parts together for interest. No sign of any rear light ever fitted and saddle mounting is unlike any other pictures seen of similar m/cs.

I am assembling all the parts to pass the m/c on, as a couple of strokes have left me unable to do much with it.

Many thanks again for your help.

Looking for measurements to construct a side car chassis to suit 1927 EW Douglas 350cc which I intend to fit a tradesman box to
Regards LBHill

Quote from: Hutch(Dave or Doug: Maybe this thread should be in the General Douglas Discussion Section??)

Thanks Hutch. Moving now.

Quote from: Harry 5 on 24 Apr 2025 at 16:02 The needle valve and washer were stored with the carburetor, but no room for them there. Is it from the float chamber ??


The only piece not found is a mounting for the 'fuel cell' for the headlight.  From the length of connecting hose it must mount near the lamp. I haven't managed to see enough detail on any photographs with the cell fitted. If anyone has a picture of the mounting it would be much appreciated.

Hi Harry,

Yes the needle valve is from the float chamber. the cone seals on the inside of the fuel inlet pipe fitting in the base of the float bowl when the fuel level is correct. the needle goes through the hole in the middle of the float and the upper part above the clip goes into the underside of the tickler on the float bowl cover (so the carby can be flooded for cold starting).

The carbide acetylene gas generator (quite often just called a "generator" which sometimes causes confusion obviously) is often mounted on the frame tube below the saddle of the 2 3/4hp. Early machines did not have a specific lug for the "generator" but the manufacturer of the lamp equipment supplied a clamp to mount it. Later Douglas 2 3/4hp models (23-24 onwards??) had a specific lug on the frame (I have marked your picture up showing the lug). There is a U shaped bracket that goes between the frame lug and the generator. I don't have a picture of a genuine one but have included one of a reproduction one. The generator often had a T-piece for the hose so that one tube went to the headlamp and another to the tail lamp.

Quite often riders attach the generator to the handlebars with brackets, very close to the lamp - the original set up on your machine may have been this (?). Often these brackets also hold the lamp. I will see if I can find some period pictures of this setup and post them.

There is quite a bit of information on the forum about various modern belt solutions for the 2 3/4hp machines. A bit of searching should hopefully turn them up.

(Dave or Doug: Maybe this thread should be in the General Douglas Discussion Section??)

Hope this helps.

Cheers

Hutch

Hi all

I am currently trying to piece together front and rear hubs for my 1924 TS out of a box of parts. 
Does anyone have a breakdown picture of the front and rear hubs ?

Best regards
Andrew Morcom

I have been assembling an inherited Douglas first registered January 1923 and have some spare parts that I assume went with it. The needle valve and washer were stored with the carburetor, but no room for them there. Is it from the float chamber ?? haven't dismantled that to check.
The belt is well past being flexible and not the usually seen riveted section or solid type.  Belt has DUNLOP molded in outer edge so guess was bought in a reel and cut to length. Pins attaching the end fittings are square headed screws.

The only piece not found is a mounting for the 'fuel cell' for the headlight.  From the length of connecting hose it must mount near the lamp. I haven't managed to see enough detail on any photographs with the cell fitted. If anyone has a picture of the mounting it would be much appreciated.

The m/c has not been run on the road since its owner failed to return from WW2 and passed to my father-in-law some time after that. Then it had short runs off road at local fetes till the 60's before being dismantled and stored. The belts/tyres etc are presumably original WW2 vintage so guess they should be a bit stiff by now.